diff --git a/src/DesktopApp.vue b/src/DesktopApp.vue
index 1a8d4ccc..1fd43ad1 100644
--- a/src/DesktopApp.vue
+++ b/src/DesktopApp.vue
@@ -4,10 +4,10 @@
     </v-app>
     <v-snackbar class="cursor-pointer" color="notification-background" location="top"
                 :multi-line="true" :timeout="-1" :close-on-content-click="true" v-model="showNotification">
-        <v-tooltip activator="parent">{{ $t('Click to close') }}</v-tooltip>
+        <v-tooltip activator="parent">{{ tt('Click to close') }}</v-tooltip>
         <div class="d-inline-flex">
-            <img alt="logo" class="notification-logo" :src="ezBookkeepingLogoPath" />
-            <span class="ml-2">{{ $t('global.app.title') }}</span>
+            <img alt="logo" class="notification-logo" :src="APPLICATION_LOGO_PATH" />
+            <span class="ml-2">{{ tt('global.app.title') }}</span>
         </div>
         <div>
             {{ currentNotificationContent }}
@@ -15,11 +15,14 @@
     </v-snackbar>
 </template>
 
-<script>
+<script setup lang="ts">
+import { type Ref, ref, computed, watch, onMounted } from 'vue';
+
 import { useTheme } from 'vuetify';
 import { register } from 'register-service-worker';
 
-import { mapStores } from 'pinia';
+import { useI18n } from '@/locales/helpers.ts';
+
 import { useRootStore } from '@/stores/index.js';
 import { useSettingsStore } from '@/stores/setting.ts';
 import { useUserStore } from '@/stores/user.ts';
@@ -33,90 +36,83 @@ import { initMapProvider } from '@/lib/map/index.ts';
 import { isUserLogined, isUserUnlocked } from '@/lib/userstate.ts';
 import { getSystemTheme, setExpenseAndIncomeAmountColor } from '@/lib/ui/common.ts';
 
-export default {
-    data() {
-        return {
-            showNotification: false
-        }
-    },
-    computed: {
-        ...mapStores(useRootStore, useSettingsStore, useUserStore, useTokensStore, useExchangeRatesStore),
-        ezBookkeepingLogoPath() {
-            return APPLICATION_LOGO_PATH;
-        },
-        currentNotificationContent() {
-            return this.rootStore.currentNotification;
-        }
-    },
-    watch: {
-        currentNotificationContent: function (newValue) {
-            this.showNotification = !!newValue;
-        }
-    },
-    created() {
-        const self = this;
-        const theme = useTheme();
+const { tt, getCurrentLanguageInfo, setLanguage, initLocale } = useI18n();
 
-        if (self.settingsStore.appSettings.theme === ThemeType.Light) {
-            theme.global.name.value = ThemeType.Light;
-        } else if (self.settingsStore.appSettings.theme === ThemeType.Dark) {
+const theme = useTheme();
+
+const rootStore = useRootStore();
+const settingsStore = useSettingsStore();
+const userStore = useUserStore();
+const tokensStore = useTokensStore();
+const exchangeRatesStore = useExchangeRatesStore();
+
+const showNotification: Ref<boolean> = ref(false);
+
+const currentNotificationContent = computed<string | null>(() => rootStore.currentNotification);
+
+onMounted(() => {
+    document.addEventListener('DOMContentLoaded', () => {
+        const languageInfo = getCurrentLanguageInfo();
+        initMapProvider(languageInfo?.alternativeLanguageTag);
+    });
+});
+
+watch(currentNotificationContent, (newValue) => {
+    showNotification.value = !!newValue;
+});
+
+if (settingsStore.appSettings.theme === ThemeType.Light) {
+    theme.global.name.value = ThemeType.Light;
+} else if (settingsStore.appSettings.theme === ThemeType.Dark) {
+    theme.global.name.value = ThemeType.Dark;
+} else {
+    theme.global.name.value = getSystemTheme();
+}
+
+window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', function (e) {
+    if (settingsStore.appSettings.theme === 'auto') {
+        if (e.matches) {
             theme.global.name.value = ThemeType.Dark;
         } else {
-            theme.global.name.value = getSystemTheme();
+            theme.global.name.value = ThemeType.Light;
         }
-
-        window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', function (e) {
-            if (self.settingsStore.appSettings.theme === 'auto') {
-                if (e.matches) {
-                    theme.global.name.value = ThemeType.Dark;
-                } else {
-                    theme.global.name.value = ThemeType.Light;
-                }
-            }
-        });
-
-        let localeDefaultSettings = self.$locale.initLocale(self.userStore.currentUserLanguage, self.settingsStore.appSettings.timeZone);
-        self.settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
-
-        setExpenseAndIncomeAmountColor(self.userStore.currentUserExpenseAmountColor, self.userStore.currentUserIncomeAmountColor);
-
-        if (isUserLogined()) {
-            if (!self.settingsStore.appSettings.applicationLock || isUserUnlocked()) {
-                // refresh token if user is logined
-                self.tokensStore.refreshTokenAndRevokeOldToken().then(response => {
-                    if (response.user) {
-                        localeDefaultSettings = self.$locale.setLanguage(response.user.language);
-                        self.settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
-
-                        setExpenseAndIncomeAmountColor(response.user.expenseAmountColor, response.user.incomeAmountColor);
-
-                        if (response.notificationContent) {
-                            self.rootStore.setNotificationContent(response.notificationContent);
-                        }
-                    }
-                });
-
-                // auto refresh exchange rates data
-                if (self.settingsStore.appSettings.autoUpdateExchangeRatesData) {
-                    self.exchangeRatesStore.getLatestExchangeRates({ silent: true, force: false });
-                }
-            }
-        }
-
-        if (isProduction()) {
-            register('./sw.js', {
-                registrationOptions: {
-                    scope: './'
-                }
-            });
-        }
-    },
-    mounted() {
-        document.addEventListener('DOMContentLoaded', () => {
-            const languageInfo = this.$locale.getCurrentLanguageInfo();
-            initMapProvider(languageInfo ? languageInfo.alternativeLanguageTag : null);
-        });
     }
+});
+
+let localeDefaultSettings = initLocale(userStore.currentUserLanguage, settingsStore.appSettings.timeZone);
+settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
+
+setExpenseAndIncomeAmountColor(userStore.currentUserExpenseAmountColor, userStore.currentUserIncomeAmountColor);
+
+if (isUserLogined()) {
+    if (!settingsStore.appSettings.applicationLock || isUserUnlocked()) {
+        // refresh token if user is logined
+        tokensStore.refreshTokenAndRevokeOldToken().then(response => {
+            if (response.user) {
+                localeDefaultSettings = setLanguage(response.user.language);
+                settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
+
+                setExpenseAndIncomeAmountColor(response.user.expenseAmountColor, response.user.incomeAmountColor);
+
+                if (response.notificationContent) {
+                    rootStore.setNotificationContent(response.notificationContent);
+                }
+            }
+        });
+
+        // auto refresh exchange rates data
+        if (settingsStore.appSettings.autoUpdateExchangeRatesData) {
+            exchangeRatesStore.getLatestExchangeRates({ silent: true, force: false });
+        }
+    }
+}
+
+if (isProduction()) {
+    register('./sw.js', {
+        registrationOptions: {
+            scope: './'
+        }
+    });
 }
 </script>
 
diff --git a/src/MobileApp.vue b/src/MobileApp.vue
index 30e34167..6847b585 100644
--- a/src/MobileApp.vue
+++ b/src/MobileApp.vue
@@ -4,11 +4,16 @@
     </f7-app>
 </template>
 
-<script>
+<script setup lang="ts">
+import { type Ref, ref, computed, watch, onMounted } from 'vue';
+
+import type { Notification } from 'framework7/components/notification';
+import type { Actions, Dialog, Popover, Popup, Sheet } from 'framework7/types';
 import { f7ready } from 'framework7-vue';
 import routes from './router/mobile.js';
 
-import { mapStores } from 'pinia';
+import { useI18n } from '@/locales/helpers.ts';
+
 import { useRootStore } from '@/stores/index.js';
 import { useSettingsStore } from '@/stores/setting.ts';
 import { useUserStore } from '@/stores/user.ts';
@@ -24,10 +29,23 @@ import { isUserLogined, isUserUnlocked } from '@/lib/userstate.ts';
 import { setExpenseAndIncomeAmountColor } from '@/lib/ui/common.ts';
 import { isModalShowing, setAppFontSize } from '@/lib/ui/mobile.js';
 
-export default {
-    data() {
-        const self = this;
-        let darkMode = 'auto';
+const { tt, getCurrentLanguageInfo, setLanguage, initLocale } = useI18n();
+
+const rootStore = useRootStore();
+const settingsStore = useSettingsStore();
+const userStore = useUserStore();
+const tokensStore = useTokensStore();
+const exchangeRatesStore = useExchangeRatesStore();
+
+const f7params: Ref<object> = ref({
+    name: 'ezBookkeeping',
+    theme: 'ios',
+    colors: {
+        primary: '#c67e48'
+    },
+    routes: routes,
+    darkMode: (() => {
+        let darkMode: boolean | string = 'auto';
 
         if (getTheme() === ThemeType.Light) {
             darkMode = false;
@@ -35,207 +53,190 @@ export default {
             darkMode = true;
         }
 
-        return {
-            notification: null,
-            f7params: {
-                name: 'ezBookkeeping',
-                theme: 'ios',
-                colors: {
-                    primary: '#c67e48'
-                },
-                routes: routes,
-                darkMode: darkMode,
-                touch: {
-                    disableContextMenu: true,
-                    tapHold: true
-                },
-                serviceWorker: {
-                    path: isProduction() ? './sw.js' : undefined,
-                    scope: './',
-                },
-                actions: {
-                    animate: isEnableAnimate(),
-                    backdrop: true,
-                    closeOnEscape: true
-                },
-                dialog: {
-                    animate: isEnableAnimate(),
-                    backdrop: true
-                },
-                popover: {
-                    animate: isEnableAnimate(),
-                    backdrop: true,
-                    closeOnEscape: true
-                },
-                popup: {
-                    animate: isEnableAnimate(),
-                    backdrop: true,
-                    closeOnEscape: true,
-                    swipeToClose: true
-                },
-                sheet: {
-                    animate: isEnableAnimate(),
-                    backdrop: true,
-                    closeOnEscape: true
-                },
-                smartSelect: {
-                    routableModals: false
-                },
-                view: {
-                    animate: isEnableAnimate(),
-                    browserHistory: !self.isiOSHomeScreenMode(),
-                    browserHistoryInitialMatch: true,
-                    browserHistoryAnimate: false,
-                    iosSwipeBackAnimateShadow: false,
-                    mdSwipeBackAnimateShadow: false
-                }
-            },
-            isDarkMode: undefined,
-            hasPushPopupBackdrop: undefined,
-            hasBackdrop: undefined
-        }
+        return darkMode;
+    })(),
+    touch: {
+        disableContextMenu: true,
+        tapHold: true
     },
-    computed: {
-        ...mapStores(useRootStore, useSettingsStore, useUserStore, useTokensStore, useExchangeRatesStore),
-        currentNotificationContent() {
-            return this.rootStore.currentNotification;
-        }
+    serviceWorker: {
+        path: isProduction() ? './sw.js' : undefined,
+        scope: './',
     },
-    watch: {
-        currentNotificationContent: function (newValue) {
-            const self = this;
+    actions: {
+        animate: isEnableAnimate(),
+        backdrop: true,
+        closeOnEscape: true
+    },
+    dialog: {
+        animate: isEnableAnimate(),
+        backdrop: true
+    },
+    popover: {
+        animate: isEnableAnimate(),
+        backdrop: true,
+        closeOnEscape: true
+    },
+    popup: {
+        animate: isEnableAnimate(),
+        backdrop: true,
+        closeOnEscape: true,
+        swipeToClose: true
+    },
+    sheet: {
+        animate: isEnableAnimate(),
+        backdrop: true,
+        closeOnEscape: true
+    },
+    smartSelect: {
+        routableModals: false
+    },
+    view: {
+        animate: isEnableAnimate(),
+        browserHistory: !isiOSHomeScreenMode(),
+        browserHistoryInitialMatch: true,
+        browserHistoryAnimate: false,
+        iosSwipeBackAnimateShadow: false,
+        mdSwipeBackAnimateShadow: false
+    }
+});
 
-            if (self.notification) {
-                self.notification.close();
-                self.notification.destroy();
-                self.notification = null;
+const notification: Ref<Notification.Notification | null> = ref(null);
+
+const isDarkMode: Ref<boolean | undefined> = ref(undefined);
+const hasPushPopupBackdrop: Ref<boolean | undefined> = ref(undefined);
+const hasBackdrop: Ref<boolean | undefined> = ref(undefined);
+const currentNotificationContent = computed<string | null>(() => rootStore.currentNotification);
+
+function isiOSHomeScreenMode(): boolean {
+    if ((/iphone|ipod|ipad/gi).test(navigator.platform) && (/Safari/i).test(navigator.appVersion) &&
+        window.matchMedia && window.matchMedia('(display-mode: standalone)').matches
+    ) {
+        return true;
+    }
+
+    return false;
+}
+
+function setThemeColorMeta(darkMode: boolean | undefined): void {
+    if (hasPushPopupBackdrop.value) {
+        document.querySelector('meta[name=theme-color]')?.setAttribute('content', '#000');
+        return;
+    }
+
+    if (darkMode) {
+        if (hasBackdrop.value) {
+            document.querySelector('meta[name=theme-color]')?.setAttribute('content', '#0b0b0b');
+        } else {
+            document.querySelector('meta[name=theme-color]')?.setAttribute('content', '#121212');
+        }
+    } else {
+        if (hasBackdrop.value) {
+            document.querySelector('meta[name=theme-color]')?.setAttribute('content', '#949495');
+        } else {
+            document.querySelector('meta[name=theme-color]')?.setAttribute('content', '#f6f6f8');
+        }
+    }
+}
+
+function onBackdropChanged(element: { push?: boolean, opened?: boolean }): void {
+    if (element.push) {
+        hasPushPopupBackdrop.value = element.opened;
+    } else {
+        hasBackdrop.value = element.opened;
+    }
+
+    setThemeColorMeta(isDarkMode.value);
+}
+
+onMounted(() => {
+    setAppFontSize(settingsStore.appSettings.fontSize);
+
+    f7ready((f7) => {
+        isDarkMode.value = f7.darkMode;
+        setThemeColorMeta(f7.darkMode);
+
+        f7.on('actionsOpen', (actions: Actions.Actions) => onBackdropChanged(actions));
+        f7.on('actionsClose', (actions: Actions.Actions) => onBackdropChanged(actions));
+        f7.on('dialogOpen', (dialog: Dialog.Dialog) => onBackdropChanged(dialog));
+        f7.on('dialogClose', (dialog: Dialog.Dialog) => onBackdropChanged(dialog));
+        f7.on('popoverOpen', (popover: Popover.Popover) => onBackdropChanged(popover));
+        f7.on('popoverClose', (popover: Popover.Popover) => onBackdropChanged(popover));
+        f7.on('popupOpen', (popup: Popup.Popup) => onBackdropChanged(popup));
+        f7.on('popupClose', (popup: Popup.Popup) => onBackdropChanged(popup));
+        f7.on('sheetOpen', (sheet: Sheet.Sheet) => onBackdropChanged(sheet));
+        f7.on('sheetClose', (sheet: Sheet.Sheet) => onBackdropChanged(sheet));
+
+        f7.on('pageBeforeOut',  () => {
+            if (isModalShowing()) {
+                f7.actions.close('.actions-modal.modal-in', false);
+                f7.dialog.close('.dialog.modal-in', false);
+                f7.popover.close('.popover.modal-in', false);
+                f7.popup.close('.popup.modal-in', false);
+                f7.sheet.close('.sheet-modal.modal-in', false);
             }
+        });
 
-            if (newValue) {
-                f7ready((f7) => {
-                    self.notification = f7.notification.create({
-                        icon: `<img alt="logo" src="${APPLICATION_LOGO_PATH}" />`,
-                        title: self.$t('global.app.title'),
-                        text: newValue,
-                        closeOnClick: true,
-                        on: {
-                            close() {
-                                self.rootStore.setNotificationContent(null);
-                            }
-                        }
-                    }).open();
-                });
-            }
-        }
-    },
-    created() {
-        const self = this;
+        f7.on('darkModeChange', (darkMode) => {
+            isDarkMode.value = darkMode;
+            setThemeColorMeta(darkMode);
+        });
+    });
 
-        let localeDefaultSettings = self.$locale.initLocale(self.userStore.currentUserLanguage, self.settingsStore.appSettings.timeZone);
-        self.settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
+    document.addEventListener('DOMContentLoaded', () => {
+        const languageInfo = getCurrentLanguageInfo();
+        initMapProvider(languageInfo?.alternativeLanguageTag);
+    });
+});
 
-        setExpenseAndIncomeAmountColor(self.userStore.currentUserExpenseAmountColor, self.userStore.currentUserIncomeAmountColor);
-
-        if (isUserLogined()) {
-            if (!self.settingsStore.appSettings.applicationLock || isUserUnlocked()) {
-                // refresh token if user is logined
-                self.tokensStore.refreshTokenAndRevokeOldToken().then(response => {
-                    if (response.user) {
-                        localeDefaultSettings = self.$locale.setLanguage(response.user.language);
-                        self.settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
-
-                        setExpenseAndIncomeAmountColor(response.user.expenseAmountColor, response.user.incomeAmountColor);
-
-                        if (response.notificationContent) {
-                            self.rootStore.setNotificationContent(response.notificationContent);
-                        }
-                    }
-                });
-
-                // auto refresh exchange rates data
-                if (self.settingsStore.appSettings.autoUpdateExchangeRatesData) {
-                    self.exchangeRatesStore.getLatestExchangeRates({ silent: true, force: false });
-                }
-            }
-        }
-    },
-    mounted() {
-        setAppFontSize(this.settingsStore.appSettings.fontSize);
+watch(currentNotificationContent, (newValue) => {
+    if (notification.value) {
+        notification.value.close();
+        notification.value.destroy();
+        notification.value = null;
+    }
 
+    if (newValue) {
         f7ready((f7) => {
-            this.isDarkMode = f7.darkMode;
-            this.setThemeColorMeta(f7.darkMode);
-
-            f7.on('actionsOpen', (event) => this.onBackdropChanged(event));
-            f7.on('actionsClose', (event) => this.onBackdropChanged(event));
-            f7.on('dialogOpen', (event) => this.onBackdropChanged(event));
-            f7.on('dialogClose', (event) => this.onBackdropChanged(event));
-            f7.on('popoverOpen', (event) => this.onBackdropChanged(event));
-            f7.on('popoverClose', (event) => this.onBackdropChanged(event));
-            f7.on('popupOpen', (event) => this.onBackdropChanged(event));
-            f7.on('popupClose', (event) => this.onBackdropChanged(event));
-            f7.on('sheetOpen', (event) => this.onBackdropChanged(event));
-            f7.on('sheetClose', (event) => this.onBackdropChanged(event));
-
-            f7.on('pageBeforeOut',  () => {
-                if (isModalShowing()) {
-                    f7.actions.close('.actions-modal.modal-in', false);
-                    f7.dialog.close('.dialog.modal-in', false);
-                    f7.popover.close('.popover.modal-in', false);
-                    f7.popup.close('.popup.modal-in', false);
-                    f7.sheet.close('.sheet-modal.modal-in', false);
+            notification.value = f7.notification.create({
+                icon: `<img alt="logo" src="${APPLICATION_LOGO_PATH}" />`,
+                title: tt('global.app.title'),
+                text: newValue,
+                closeOnClick: true,
+                on: {
+                    close() {
+                        rootStore.setNotificationContent(null);
+                    }
                 }
-            });
+            }).open();
+        });
+    }
+});
 
-            f7.on('darkModeChange', (isDarkMode) => {
-                this.isDarkMode = isDarkMode;
-                this.setThemeColorMeta(isDarkMode);
-            });
+let localeDefaultSettings = initLocale(userStore.currentUserLanguage, settingsStore.appSettings.timeZone);
+settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
+
+setExpenseAndIncomeAmountColor(userStore.currentUserExpenseAmountColor, userStore.currentUserIncomeAmountColor);
+
+if (isUserLogined()) {
+    if (!settingsStore.appSettings.applicationLock || isUserUnlocked()) {
+        // refresh token if user is logined
+        tokensStore.refreshTokenAndRevokeOldToken().then(response => {
+            if (response.user) {
+                localeDefaultSettings = setLanguage(response.user.language);
+                settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
+
+                setExpenseAndIncomeAmountColor(response.user.expenseAmountColor, response.user.incomeAmountColor);
+
+                if (response.notificationContent) {
+                    rootStore.setNotificationContent(response.notificationContent);
+                }
+            }
         });
 
-        document.addEventListener('DOMContentLoaded', () => {
-            const languageInfo = this.$locale.getCurrentLanguageInfo();
-            initMapProvider(languageInfo ? languageInfo.alternativeLanguageTag : null);
-        });
-    },
-    methods: {
-        isiOSHomeScreenMode() {
-            if ((/iphone|ipod|ipad/gi).test(navigator.platform) && (/Safari/i).test(navigator.appVersion) &&
-                window.matchMedia && window.matchMedia('(display-mode: standalone)').matches
-            ) {
-                return true;
-            }
-
-            return false;
-        },
-        onBackdropChanged(event) {
-            if (event.push) {
-                this.hasPushPopupBackdrop = event.opened;
-            } else {
-                this.hasBackdrop = event.opened;
-            }
-
-            this.setThemeColorMeta(this.isDarkMode);
-        },
-        setThemeColorMeta(isDarkMode) {
-            if (this.hasPushPopupBackdrop) {
-                document.querySelector('meta[name=theme-color]').setAttribute('content', '#000');
-                return;
-            }
-
-            if (isDarkMode) {
-                if (this.hasBackdrop) {
-                    document.querySelector('meta[name=theme-color]').setAttribute('content', '#0b0b0b');
-                } else {
-                    document.querySelector('meta[name=theme-color]').setAttribute('content', '#121212');
-                }
-            } else {
-                if (this.hasBackdrop) {
-                    document.querySelector('meta[name=theme-color]').setAttribute('content', '#949495');
-                } else {
-                    document.querySelector('meta[name=theme-color]').setAttribute('content', '#f6f6f8');
-                }
-            }
+        // auto refresh exchange rates data
+        if (settingsStore.appSettings.autoUpdateExchangeRatesData) {
+            exchangeRatesStore.getLatestExchangeRates({ silent: true, force: false });
         }
     }
 }
diff --git a/src/components/common/MapView.vue b/src/components/common/MapView.vue
index a39213ca..240dc76e 100644
--- a/src/components/common/MapView.vue
+++ b/src/components/common/MapView.vue
@@ -11,7 +11,7 @@
 <script setup lang="ts">
 import { type Ref, ref, computed, useTemplateRef } from 'vue';
 
-import { useI18n } from '@/locales/helper.js';
+import { useI18n } from '@/locales/helpers.ts';
 
 import { copyObjectTo } from '@/lib/common.ts';
 import type { MapInstance, MapPosition } from '@/lib/map/base.ts';
diff --git a/src/components/desktop/ConfirmDialog.vue b/src/components/desktop/ConfirmDialog.vue
index 1420b77c..2aa2f1ff 100644
--- a/src/components/desktop/ConfirmDialog.vue
+++ b/src/components/desktop/ConfirmDialog.vue
@@ -7,8 +7,8 @@
             <v-card-text v-if="textContent" class="pa-4 pb-6">{{ textContent }}</v-card-text>
             <v-card-actions class="px-4 pb-4">
                 <v-spacer></v-spacer>
-                <v-btn color="gray" @click="cancel">{{ $t('Cancel') }}</v-btn>
-                <v-btn :color="finalColor" @click="confirm">{{ $t('OK') }}</v-btn>
+                <v-btn color="gray" @click="cancel">{{ tt('Cancel') }}</v-btn>
+                <v-btn :color="finalColor" @click="confirm">{{ tt('OK') }}</v-btn>
             </v-card-actions>
         </v-card>
     </v-dialog>
@@ -17,7 +17,8 @@
 <script setup lang="ts">
 import { type Ref, ref, watch } from 'vue';
 
-import { useI18n } from '@/locales/helper.js';
+import { useI18n } from '@/locales/helpers.ts';
+
 import { isString } from '@/lib/common.ts';
 
 const props = defineProps<{
@@ -46,7 +47,7 @@ function open(titleOrText: string, textOrOptions: string | Record<string, unknow
 
     if (isString(textOrOptions)) { // second parameter is text
         titleContent.value = tt(titleOrText, options);
-        textContent.value = tt(textOrOptions, options);
+        textContent.value = tt(textOrOptions as string, options);
     } else { // second parameter is options
         const actualOptions = textOrOptions as Record<string, unknown>;
         titleContent.value = tt('global.app.title');
diff --git a/src/components/desktop/SnackBar.vue b/src/components/desktop/SnackBar.vue
index bab6fb97..b2412c37 100644
--- a/src/components/desktop/SnackBar.vue
+++ b/src/components/desktop/SnackBar.vue
@@ -3,7 +3,7 @@
         {{ messageContent }}
 
         <template #actions>
-            <v-btn color="primary" variant="text" @click="showState = false">{{ $t('Close') }}</v-btn>
+            <v-btn color="primary" variant="text" @click="showState = false">{{ tt('Close') }}</v-btn>
         </template>
     </v-snackbar>
 </template>
@@ -11,8 +11,9 @@
 <script setup lang="ts">
 import { type Ref, ref, watch } from 'vue';
 
+import { useI18n } from '@/locales/helpers.ts';
+
 import { isObject } from '@/lib/common.ts';
-import { useI18n } from '@/locales/helper.js';
 
 const emit = defineEmits<{
     (e: 'update:show', value: boolean): void
diff --git a/src/components/desktop/SwitchToMobileDialog.vue b/src/components/desktop/SwitchToMobileDialog.vue
index 48cb6697..dd3c3917 100644
--- a/src/components/desktop/SwitchToMobileDialog.vue
+++ b/src/components/desktop/SwitchToMobileDialog.vue
@@ -3,11 +3,11 @@
         <v-card class="pa-2 pa-sm-4 pa-md-4">
             <template #title>
                 <div class="d-flex align-center justify-center">
-                    <h4 class="text-h4">{{ $t('Use on Mobile Device') }}</h4>
+                    <h4 class="text-h4">{{ tt('Use on Mobile Device') }}</h4>
                 </div>
             </template>
             <template #subtitle>
-                <div class="text-body-1 text-center text-wrap mt-4">{{ $t('You can scan the QR code below on your mobile device.') }}</div>
+                <div class="text-body-1 text-center text-wrap mt-4">{{ tt('You can scan the QR code below on your mobile device.') }}</div>
             </template>
             <v-card-text class="mb-md-4">
                 <v-row>
@@ -20,8 +20,8 @@
             </v-card-text>
             <v-card-text class="overflow-y-visible">
                 <div class="w-100 d-flex justify-center gap-4">
-                    <v-btn :href="mobileVersionPath">{{$t('Switch to Mobile Version') }}</v-btn>
-                    <v-btn color="secondary" variant="tonal" @click="showState = false">{{ $t('Close') }}</v-btn>
+                    <v-btn :href="mobileVersionPath">{{ tt('Switch to Mobile Version') }}</v-btn>
+                    <v-btn color="secondary" variant="tonal" @click="showState = false">{{ tt('Close') }}</v-btn>
                 </div>
             </v-card-text>
         </v-card>
@@ -31,6 +31,8 @@
 <script setup lang="ts">
 import { computed } from 'vue';
 
+import { useI18n } from '@/locales/helpers.ts';
+
 import { getMobileUrlQrCodePath } from '@/lib/qrcode.ts';
 import { getMobileVersionPath } from '@/lib/version.ts';
 
@@ -42,6 +44,8 @@ const emit = defineEmits<{
     (e: 'update:show', value: boolean): void
 }>();
 
+const { tt } = useI18n();
+
 const mobileUrlQrCodePath = getMobileUrlQrCodePath();
 const mobileVersionPath = getMobileVersionPath();
 
diff --git a/src/components/mobile/ColorSelectionSheet.vue b/src/components/mobile/ColorSelectionSheet.vue
index 267f9374..3bcb2c9b 100644
--- a/src/components/mobile/ColorSelectionSheet.vue
+++ b/src/components/mobile/ColorSelectionSheet.vue
@@ -6,7 +6,7 @@
             <div class="swipe-handler"></div>
             <div class="left"></div>
             <div class="right">
-                <f7-link sheet-close :text="$t('Done')"></f7-link>
+                <f7-link sheet-close :text="tt('Done')"></f7-link>
             </div>
         </f7-toolbar>
         <f7-page-content>
@@ -31,6 +31,8 @@
 <script setup lang="ts">
 import { type Ref, ref, computed } from 'vue';
 
+import { useI18n } from '@/locales/helpers.ts';
+
 import type { ColorValue, ColorInfo } from '@/core/color.ts';
 import { arrayContainsFieldValue } from '@/lib/common.ts';
 import { getColorsInRows } from '@/lib/color.ts';
@@ -48,6 +50,8 @@ const emit = defineEmits<{
     (e: 'update:show', value: boolean): void
 }>();
 
+const { tt } = useI18n();
+
 const currentValue: Ref<ColorValue> = ref(props.modelValue);
 const itemPerRow: Ref<number> = ref(props.columnCount || 7);
 
diff --git a/src/components/mobile/IconSelectionSheet.vue b/src/components/mobile/IconSelectionSheet.vue
index 612a8a0d..5c02bc3a 100644
--- a/src/components/mobile/IconSelectionSheet.vue
+++ b/src/components/mobile/IconSelectionSheet.vue
@@ -6,7 +6,7 @@
             <div class="swipe-handler"></div>
             <div class="left"></div>
             <div class="right">
-                <f7-link sheet-close :text="$t('Done')"></f7-link>
+                <f7-link sheet-close :text="tt('Done')"></f7-link>
             </div>
         </f7-toolbar>
         <f7-page-content>
@@ -31,6 +31,8 @@
 <script setup lang="ts">
 import { type Ref, ref, computed } from 'vue';
 
+import { useI18n } from '@/locales/helpers.ts';
+
 import type { IconInfo, IconInfoWithId } from '@/core/icon.ts';
 import { arrayContainsFieldValue } from '@/lib/common.ts';
 import { getIconsInRows } from '@/lib/icon.ts';
@@ -49,6 +51,8 @@ const emit = defineEmits<{
     (e: 'update:show', value: boolean): void
 }>();
 
+const { tt } = useI18n();
+
 const currentValue: Ref<string> = ref(props.modelValue);
 const itemPerRow: Ref<number> = ref(props.columnCount || 7);
 
diff --git a/src/components/mobile/InformationSheet.vue b/src/components/mobile/InformationSheet.vue
index c092a9cb..7c70435d 100644
--- a/src/components/mobile/InformationSheet.vue
+++ b/src/components/mobile/InformationSheet.vue
@@ -17,7 +17,7 @@
                 </p>
                 <textarea class="information-content full-line" readonly="readonly" :rows="rowCount" :value="information"></textarea>
                 <div class="margin-top text-align-center">
-                    <f7-link @click="close" :text="$t('Close')"></f7-link>
+                    <f7-link @click="close" :text="tt('Close')"></f7-link>
                 </div>
             </div>
         </f7-page-content>
@@ -27,6 +27,8 @@
 <script setup lang="ts">
 import { useTemplateRef, watch, onMounted, onUpdated } from 'vue';
 
+import { useI18n } from '@/locales/helpers.ts';
+
 import { ClipboardHolder } from '@/lib/clipboard.ts';
 
 const props = defineProps<{
@@ -43,6 +45,8 @@ const emit = defineEmits<{
     (e: 'info:copied'): void
 }>();
 
+const { tt } = useI18n();
+
 const iconCopyToClipboard = useTemplateRef('copyToClipboardIcon');
 
 let clipboardHolder: ClipboardHolder | null = null;
diff --git a/src/components/mobile/MapSheet.vue b/src/components/mobile/MapSheet.vue
index 728d8584..8f80c2d4 100644
--- a/src/components/mobile/MapSheet.vue
+++ b/src/components/mobile/MapSheet.vue
@@ -5,23 +5,23 @@
             <div class="swipe-handler"></div>
             <div class="left"></div>
             <div class="right">
-                <f7-link :text="$t('Done')" @click="save"></f7-link>
+                <f7-link :text="tt('Done')" @click="save"></f7-link>
             </div>
         </f7-toolbar>
         <f7-page-content class="no-margin-vertical no-padding-vertical">
             <map-view ref="map" height="400px" :geo-location="geoLocation">
                 <template #error-title="{ mapSupported, mapDependencyLoaded }">
                     <div class="display-flex padding justify-content-space-between align-items-center">
-                        <div class="ebk-sheet-title" v-if="!mapSupported"><b>{{ $t('Unsupported Map Provider') }}</b></div>
-                        <div class="ebk-sheet-title" v-else-if="!mapDependencyLoaded"><b>{{ $t('Cannot Initialize Map') }}</b></div>
+                        <div class="ebk-sheet-title" v-if="!mapSupported"><b>{{ tt('Unsupported Map Provider') }}</b></div>
+                        <div class="ebk-sheet-title" v-else-if="!mapDependencyLoaded"><b>{{ tt('Cannot Initialize Map') }}</b></div>
                         <div class="ebk-sheet-title" v-else></div>
                     </div>
                 </template>
                 <template #error-content>
                     <div class="padding-horizontal padding-bottom">
-                        <p class="no-margin">{{ $t('Please refresh the page and try again. If the error persists, ensure that the server\'s map settings are correctly configured.') }}</p>
+                        <p class="no-margin">{{ tt('Please refresh the page and try again. If the error persists, ensure that the server\'s map settings are correctly configured.') }}</p>
                         <div class="margin-top text-align-center">
-                            <f7-link @click="close" :text="$t('Close')"></f7-link>
+                            <f7-link @click="close" :text="tt('Close')"></f7-link>
                         </div>
                     </div>
                 </template>
@@ -34,6 +34,8 @@
 import { computed, useTemplateRef } from 'vue';
 import MapView from '@/components/common/MapView.vue';
 
+import { useI18n } from '@/locales/helpers.ts';
+
 import type { MapPosition } from '@/lib/map/base.ts';
 
 type MapViewType = InstanceType<typeof MapView>;
@@ -48,6 +50,8 @@ const emit = defineEmits<{
     (e: 'update:show', value: boolean): void
 }>();
 
+const { tt } = useI18n();
+
 const map = useTemplateRef<MapViewType>('map');
 
 const geoLocation = computed<MapPosition | undefined>({
diff --git a/src/components/mobile/PasscodeInputSheet.vue b/src/components/mobile/PasscodeInputSheet.vue
index 0729273b..509de012 100644
--- a/src/components/mobile/PasscodeInputSheet.vue
+++ b/src/components/mobile/PasscodeInputSheet.vue
@@ -17,19 +17,19 @@
                         floating-label
                         clear-button
                         class="no-margin no-padding-bottom"
-                        :label="$t('Passcode')"
-                        :placeholder="$t('Passcode')"
+                        :label="tt('Passcode')"
+                        :placeholder="tt('Passcode')"
                         v-model:value="currentPasscode"
                         @keyup.enter="confirm()"
                     ></f7-list-input>
                 </f7-list>
                 <f7-button large fill
                            :class="{ 'disabled': !currentPasscode || confirmDisabled }"
-                           :text="$t('Continue')"
+                           :text="tt('Continue')"
                            @click="confirm">
                 </f7-button>
                 <div class="margin-top text-align-center">
-                    <f7-link :class="{ 'disabled': cancelDisabled }" @click="cancel" :text="$t('Cancel')"></f7-link>
+                    <f7-link :class="{ 'disabled': cancelDisabled }" @click="cancel" :text="tt('Cancel')"></f7-link>
                 </div>
             </div>
         </f7-page-content>
@@ -39,6 +39,8 @@
 <script setup lang="ts">
 import { type Ref, ref } from 'vue';
 
+import { useI18n } from '@/locales/helpers.ts';
+
 const props = defineProps<{
     modelValue: string
     title?: string
@@ -54,6 +56,8 @@ const emit = defineEmits<{
     (e: 'passcode:confirm', value: string): void
 }>();
 
+const { tt } = useI18n();
+
 const currentPasscode: Ref<string> = ref('');
 
 function confirm() {
diff --git a/src/components/mobile/PasswordInputSheet.vue b/src/components/mobile/PasswordInputSheet.vue
index a997cdcd..360fce2d 100644
--- a/src/components/mobile/PasswordInputSheet.vue
+++ b/src/components/mobile/PasswordInputSheet.vue
@@ -17,8 +17,8 @@
                         clear-button
                         class="no-margin no-padding-bottom"
                         :class="color ? 'color-' + color : ''"
-                        :label="$t('Current Password')"
-                        :placeholder="$t('Current Password')"
+                        :label="tt('Current Password')"
+                        :placeholder="tt('Current Password')"
                         v-model:value="currentPassword"
                         @keyup.enter="confirm()"
                     ></f7-list-input>
@@ -26,11 +26,11 @@
                 <f7-button large fill
                            :class="{ 'disabled': !currentPassword || confirmDisabled }"
                            :color="color || 'primary'"
-                           :text="$t('Continue')"
+                           :text="tt('Continue')"
                            @click="confirm">
                 </f7-button>
                 <div class="margin-top text-align-center">
-                    <f7-link :class="{ 'disabled': cancelDisabled }" @click="cancel" :text="$t('Cancel')"></f7-link>
+                    <f7-link :class="{ 'disabled': cancelDisabled }" @click="cancel" :text="tt('Cancel')"></f7-link>
                 </div>
             </div>
         </f7-page-content>
@@ -40,6 +40,8 @@
 <script setup lang="ts">
 import { type Ref, ref } from 'vue';
 
+import { useI18n } from '@/locales/helpers.ts';
+
 const props = defineProps<{
     modelValue: string
     title?: string
@@ -56,6 +58,8 @@ const emit = defineEmits<{
     (e: 'password:confirm', value: string): void
 }>();
 
+const { tt } = useI18n();
+
 const currentPassword: Ref<string> = ref('');
 
 function confirm() {
diff --git a/src/components/mobile/PinCodeInputSheet.vue b/src/components/mobile/PinCodeInputSheet.vue
index 8804ca1a..3feceff8 100644
--- a/src/components/mobile/PinCodeInputSheet.vue
+++ b/src/components/mobile/PinCodeInputSheet.vue
@@ -15,11 +15,11 @@
                 </f7-list>
                 <f7-button large fill
                            :class="{ 'disabled': !currentPinCodeValid || confirmDisabled }"
-                           :text="$t('Continue')"
+                           :text="tt('Continue')"
                            @click="confirm">
                 </f7-button>
                 <div class="margin-top text-align-center">
-                    <f7-link @click="cancel" :text="$t('Cancel')"></f7-link>
+                    <f7-link @click="cancel" :text="tt('Cancel')"></f7-link>
                 </div>
             </div>
         </f7-page-content>
@@ -29,6 +29,8 @@
 <script setup lang="ts">
 import { type Ref, ref, computed } from 'vue';
 
+import { useI18n } from '@/locales/helpers.ts';
+
 const props = defineProps<{
     modelValue: string
     title?: string
@@ -44,6 +46,8 @@ const emit = defineEmits<{
     (e: 'pincode:confirm', value: string): void
 }>();
 
+const { tt } = useI18n();
+
 const currentPinCode: Ref<string> = ref('');
 
 const currentPinCodeValid = computed<boolean>(() => {
diff --git a/src/core/datetime.ts b/src/core/datetime.ts
index 7d20d6e0..c22bddd5 100644
--- a/src/core/datetime.ts
+++ b/src/core/datetime.ts
@@ -62,6 +62,11 @@ export interface LocalizedRecentMonthDateRange {
     readonly displayName: string;
 }
 
+export interface LocalizedMeridiemIndicator {
+    readonly values: string[];
+    readonly displayValues: string[];
+}
+
 export class YearUnixTime implements UnixTimeRange {
     public readonly year: number;
     public readonly minUnixTime: number;
diff --git a/src/desktop-main.js b/src/desktop-main.js
index cccfc649..aabd8bc9 100644
--- a/src/desktop-main.js
+++ b/src/desktop-main.js
@@ -71,8 +71,8 @@ import draggable from 'vuedraggable';
 import router from '@/router/desktop.js';
 
 import { getVersion, getBuildTime } from '@/lib/version.ts';
+import { getI18nOptions } from '@/locales/helpers.ts';
 import {
-    getI18nOptions,
     translateIf,
     translateError,
     i18nFunctions
diff --git a/src/global.d.ts b/src/global.d.ts
index a156bcad..5a74c142 100644
--- a/src/global.d.ts
+++ b/src/global.d.ts
@@ -10,3 +10,15 @@ interface Window {
         [key: string]: string | number | boolean | undefined | null;
     };
 }
+
+interface Navigator {
+    browserLanguage?: string;
+}
+
+declare module "framework7/components/notification" {
+    export namespace Notification {
+        export interface Notification {
+            destroy(): void;
+        }
+    }
+}
diff --git a/src/lib/map/amap.ts b/src/lib/map/amap.ts
index e9552e35..2eac7873 100644
--- a/src/lib/map/amap.ts
+++ b/src/lib/map/amap.ts
@@ -19,7 +19,7 @@ export class AmapMapProvider implements MapProvider {
     }
 
     // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    public asyncLoadAssets(language: string): Promise<unknown> {
+    public asyncLoadAssets(language?: string): Promise<unknown> {
         if (AmapMapProvider.AMap) {
             return Promise.resolve();
         }
diff --git a/src/lib/map/baidumap.ts b/src/lib/map/baidumap.ts
index 4fdd853c..16357aeb 100644
--- a/src/lib/map/baidumap.ts
+++ b/src/lib/map/baidumap.ts
@@ -18,7 +18,7 @@ export class BaiduMapProvider implements MapProvider {
     }
 
     // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    public asyncLoadAssets(language: string): Promise<unknown> {
+    public asyncLoadAssets(language?: string): Promise<unknown> {
         if (BaiduMapProvider.BMap) {
             return Promise.resolve();
         }
diff --git a/src/lib/map/base.ts b/src/lib/map/base.ts
index a5bc8ed8..2ed02f0c 100644
--- a/src/lib/map/base.ts
+++ b/src/lib/map/base.ts
@@ -1,6 +1,6 @@
 export interface MapProvider {
     getWebsite(): string;
-    asyncLoadAssets(language: string): Promise<unknown>;
+    asyncLoadAssets(language?: string): Promise<unknown>;
     createMapInstance(): MapInstance | null;
 }
 
diff --git a/src/lib/map/googlemap.ts b/src/lib/map/googlemap.ts
index 50a03c69..4da40b35 100644
--- a/src/lib/map/googlemap.ts
+++ b/src/lib/map/googlemap.ts
@@ -15,7 +15,7 @@ export class GoogleMapProvider implements MapProvider {
         return 'https://maps.google.com';
     }
 
-    public asyncLoadAssets(language: string): Promise<unknown> {
+    public asyncLoadAssets(language?: string): Promise<unknown> {
         if (GoogleMapProvider.GoogleMap) {
             return Promise.resolve();
         }
diff --git a/src/lib/map/index.ts b/src/lib/map/index.ts
index 62d1fa00..80fb98a8 100644
--- a/src/lib/map/index.ts
+++ b/src/lib/map/index.ts
@@ -9,7 +9,7 @@ import { AmapMapProvider } from './amap.ts';
 
 let mapProvider: MapProvider | null = null;
 
-export function initMapProvider(language: string): void {
+export function initMapProvider(language?: string): void {
     const mapProviderType = getMapProvider();
 
     if (LEAFLET_TILE_SOURCES[mapProviderType] || mapProviderType === 'custom') {
diff --git a/src/lib/map/leaflet.ts b/src/lib/map/leaflet.ts
index 9c0bca9d..1bfe0e88 100644
--- a/src/lib/map/leaflet.ts
+++ b/src/lib/map/leaflet.ts
@@ -36,7 +36,7 @@ export class LeafletMapProvider implements MapProvider {
     }
 
     // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    public asyncLoadAssets(language: string): Promise<unknown> {
+    public asyncLoadAssets(language?: string): Promise<unknown> {
         return Promise.all([
             import('leaflet/dist/leaflet.css'),
             import('leaflet/dist/leaflet-src.esm.js').then(leaflet => LeafletMapProvider.Leaflet = leaflet)
diff --git a/src/lib/services.ts b/src/lib/services.ts
index f23b5e37..54f579b7 100644
--- a/src/lib/services.ts
+++ b/src/lib/services.ts
@@ -540,7 +540,7 @@ export default {
 
         return url;
     },
-    generateGoogleMapJavascriptUrl: (language: string, callbackFnName: string): string => {
+    generateGoogleMapJavascriptUrl: (language: string | undefined, callbackFnName: string): string => {
         let url = `${GOOGLE_MAP_JAVASCRIPT_URL}?key=${getGoogleMapAPIKey()}&libraries=core,marker&callback=${callbackFnName}`;
 
         if (language) {
diff --git a/src/locales/helper.js b/src/locales/helper.js
index b2f7f390..d1506676 100644
--- a/src/locales/helper.js
+++ b/src/locales/helper.js
@@ -1,7 +1,7 @@
 import { useI18n as useVueI18n } from 'vue-i18n';
 import moment from 'moment-timezone';
 
-import { defaultLanguage, allLanguages } from '@/locales/index.ts';
+import { DEFAULT_LANGUAGE, allLanguages } from '@/locales/index.ts';
 
 import { Month, WeekDay, MeridiemIndicator, LongDateFormat, ShortDateFormat, LongTimeFormat, ShortTimeFormat, DateRange, LANGUAGE_DEFAULT_DATE_TIME_FORMAT_VALUE } from '@/core/datetime.ts';
 import { TimezoneTypeForStatistics } from '@/core/timezone.ts';
@@ -113,13 +113,13 @@ function getLanguageInfo(locale) {
 
 function getDefaultLanguage() {
     if (!window || !window.navigator) {
-        return defaultLanguage;
+        return DEFAULT_LANGUAGE;
     }
 
     let browserLocale = window.navigator.browserLanguage || window.navigator.language;
 
     if (!browserLocale) {
-        return defaultLanguage;
+        return DEFAULT_LANGUAGE;
     }
 
     if (!allLanguages[browserLocale]) {
@@ -153,7 +153,7 @@ function getDefaultLanguage() {
     }
 
     if (!allLanguages[browserLocale]) {
-        return defaultLanguage;
+        return DEFAULT_LANGUAGE;
     }
 
     return browserLocale;
@@ -1270,7 +1270,7 @@ function getAllSupportedImportFileTypes(i18nGlobal, translateFn) {
                 document.anchor = document.anchor.toLowerCase().replace(/ /g, '-');
             }
 
-            if (document.language === defaultLanguage) {
+            if (document.language === DEFAULT_LANGUAGE) {
                 document.language = '';
             }
         } else {
@@ -1541,29 +1541,6 @@ function initLocale(i18nGlobal, lastUserLanguage, timezone) {
     return localeDefaultSettings;
 }
 
-export function getI18nOptions() {
-    return {
-        legacy: true,
-        locale: defaultLanguage,
-        fallbackLocale: defaultLanguage,
-        formatFallbackMessages: true,
-        messages: (function () {
-            const messages = {};
-
-            for (let locale in allLanguages) {
-                if (!Object.prototype.hasOwnProperty.call(allLanguages, locale)) {
-                    continue;
-                }
-
-                const lang = allLanguages[locale];
-                messages[locale] = lang.content;
-            }
-
-            return messages;
-        })()
-    };
-}
-
 export function translateIf(text, isTranslate, translateFn) {
     if (isTranslate) {
         return translateFn(text);
@@ -1588,7 +1565,6 @@ export function i18nFunctions(i18nGlobal) {
     return {
         getAllLanguageInfoArray: (includeSystemDefault) => getAllLanguageInfoArray(i18nGlobal.t, includeSystemDefault),
         getLanguageInfo: getLanguageInfo,
-        getDefaultLanguage: getDefaultLanguage,
         getCurrentLanguageTag: () => getCurrentLanguageTag(i18nGlobal),
         getCurrentLanguageInfo: () => getCurrentLanguageInfo(i18nGlobal),
         getCurrentLanguageDisplayName: () => getCurrentLanguageDisplayName(i18nGlobal),
diff --git a/src/locales/helpers.ts b/src/locales/helpers.ts
new file mode 100644
index 00000000..2ff3d4ac
--- /dev/null
+++ b/src/locales/helpers.ts
@@ -0,0 +1,420 @@
+import { useI18n as useVueI18n } from 'vue-i18n';
+import moment from 'moment-timezone';
+
+import { type LanguageInfo, allLanguages, DEFAULT_LANGUAGE } from '@/locales/index.ts';
+
+import {
+    type LocalizedMeridiemIndicator,
+    Month,
+    WeekDay,
+    MeridiemIndicator
+} from '@/core/datetime.ts';
+
+import type { LocaleDefaultSettings } from '@/core/setting.ts';
+import type { ErrorResponse } from '@/core/api.ts';
+
+import { KnownErrorCode, SPECIFIED_API_NOT_FOUND_ERRORS, PARAMETERIZED_ERRORS } from '@/consts/api.ts';
+
+import {
+    isString,
+    isObject
+} from '@/lib/common.ts';
+
+import {
+    isPM,
+    getTimezoneOffset
+} from '@/lib/datetime.ts';
+
+import logger from '@/lib/logger.ts';
+import services from '@/lib/services.ts';
+
+export interface LocalizedErrorParameter {
+    key: string;
+    localized: boolean;
+    value: string;
+}
+
+export interface LocalizedError {
+    message: string;
+    parameters?: LocalizedErrorParameter[];
+}
+
+export function getI18nOptions(): object {
+    return {
+        legacy: true,
+        locale: DEFAULT_LANGUAGE,
+        fallbackLocale: DEFAULT_LANGUAGE,
+        formatFallbackMessages: true,
+        messages: (function () {
+            const messages: Record<string, object> = {};
+
+            for (const languageKey in allLanguages) {
+                if (!Object.prototype.hasOwnProperty.call(allLanguages, languageKey)) {
+                    continue;
+                }
+
+                const languageInfo = allLanguages[languageKey];
+                messages[languageKey] = languageInfo.content;
+            }
+
+            return messages;
+        })()
+    };
+}
+
+export function useI18n() {
+    const { t, locale } = useVueI18n();
+
+    // private functions
+    function getLanguageInfo(languageKey: string): LanguageInfo | undefined {
+        return allLanguages[languageKey];
+    }
+
+    function getDefaultLanguage(): string {
+        if (!window || !window.navigator) {
+            return DEFAULT_LANGUAGE;
+        }
+
+        let browserLanguage = window.navigator.browserLanguage || window.navigator.language;
+
+        if (!browserLanguage) {
+            return DEFAULT_LANGUAGE;
+        }
+
+        if (!allLanguages[browserLanguage]) {
+            const languageKey = getLanguageKeyFromLanguageAlias(browserLanguage);
+
+            if (languageKey) {
+                browserLanguage = languageKey;
+            }
+        }
+
+        if (!allLanguages[browserLanguage] && browserLanguage.split('-').length > 1) { // maybe language-script-region
+            const languageTagParts = browserLanguage.split('-');
+            browserLanguage = languageTagParts[0] + '-' + languageTagParts[1];
+
+            if (!allLanguages[browserLanguage]) {
+                const languageKey = getLanguageKeyFromLanguageAlias(browserLanguage);
+
+                if (languageKey) {
+                    browserLanguage = languageKey;
+                }
+            }
+
+            if (!allLanguages[browserLanguage]) {
+                browserLanguage = languageTagParts[0];
+                const languageKey = getLanguageKeyFromLanguageAlias(browserLanguage);
+
+                if (languageKey) {
+                    browserLanguage = languageKey;
+                }
+            }
+        }
+
+        if (!allLanguages[browserLanguage]) {
+            return DEFAULT_LANGUAGE;
+        }
+
+        return browserLanguage;
+    }
+
+    function getLanguageKeyFromLanguageAlias(alias: string): string | null {
+        for (const languageKey in allLanguages) {
+            if (!Object.prototype.hasOwnProperty.call(allLanguages, languageKey)) {
+                continue;
+            }
+
+            if (languageKey.toLowerCase() === alias.toLowerCase()) {
+                return languageKey;
+            }
+
+            const langInfo = allLanguages[languageKey];
+            const aliases = langInfo.aliases;
+
+            if (!aliases || aliases.length < 1) {
+                continue;
+            }
+
+            for (let i = 0; i < aliases.length; i++) {
+                if (aliases[i].toLowerCase() === alias.toLowerCase()) {
+                    return languageKey;
+                }
+            }
+        }
+
+        return null;
+    }
+
+    function getLocalizedError(error: ErrorResponse): LocalizedError {
+        if (error.errorCode === KnownErrorCode.ApiNotFound && SPECIFIED_API_NOT_FOUND_ERRORS[error.path]) {
+            return {
+                message: `${SPECIFIED_API_NOT_FOUND_ERRORS[error.path].message}`
+            };
+        }
+
+        if (error.errorCode !== KnownErrorCode.ValidatorError) {
+            return {
+                message: `error.${error.errorMessage}`
+            };
+        }
+
+        for (let i = 0; i < PARAMETERIZED_ERRORS.length; i++) {
+            const errorInfo = PARAMETERIZED_ERRORS[i];
+            const matches = error.errorMessage.match(errorInfo.regex);
+
+            if (matches && matches.length === errorInfo.parameters.length + 1) {
+                return {
+                    message: `parameterizedError.${errorInfo.localeKey}`,
+                    parameters: errorInfo.parameters.map((param, index) => {
+                        return {
+                            key: param.field,
+                            localized: param.localized,
+                            value: matches[index + 1]
+                        }
+                    })
+                };
+            }
+        }
+
+        return {
+            message: `error.${error.errorMessage}`
+        };
+    }
+
+    function getLocalizedErrorParameters(parameters?: LocalizedErrorParameter[]): Record<string, string> {
+        const localizedParameters: Record<string, string> = {};
+
+        if (parameters) {
+            for (let i = 0; i < parameters.length; i++) {
+                const parameter = parameters[i];
+
+                if (parameter.localized) {
+                    localizedParameters[parameter.key] = t(`parameter.${parameter.value}`);
+                } else {
+                    localizedParameters[parameter.key] = parameter.value;
+                }
+            }
+        }
+
+        return localizedParameters;
+    }
+
+    function getAllMonthNames(type: string): string[] {
+        const ret = [];
+        const allMonths = Month.values();
+
+        for (let i = 0; i < allMonths.length; i++) {
+            const month = allMonths[i];
+            ret.push(t(`datetime.${month.name}.${type}`));
+        }
+
+        return ret;
+    }
+
+    function getAllWeekdayNames(type: string): string[] {
+        const ret = [];
+        const allWeekDays = WeekDay.values();
+
+        for (let i = 0; i < allWeekDays.length; i++) {
+            const weekDay = allWeekDays[i];
+            ret.push(t(`datetime.${weekDay.name}.${type}`));
+        }
+
+        return ret;
+    }
+
+    // public functions
+    function translateIf(text: string, isTranslate: boolean): string {
+        if (isTranslate) {
+            return t(text);
+        }
+
+        return text;
+    }
+
+    function translateError(message: string | { error: ErrorResponse }): string {
+        let finalMessage = '';
+        let parameters = {};
+
+        if (isObject(message) && isObject((message as { error: ErrorResponse }).error)) {
+            const localizedError = getLocalizedError((message as { error: ErrorResponse }).error);
+            finalMessage = localizedError.message;
+            parameters = getLocalizedErrorParameters(localizedError.parameters);
+        } else if (isString(message)) {
+            finalMessage = message as string;
+        } else {
+            return '';
+        }
+
+        return t(finalMessage, parameters);
+    }
+
+    function getCurrentLanguageTag(): string {
+        return locale.value;
+    }
+
+    function getCurrentLanguageInfo(): LanguageInfo {
+        const languageInfo = getLanguageInfo(locale.value);
+
+        if (languageInfo) {
+            return languageInfo;
+        }
+
+        return getLanguageInfo(getDefaultLanguage()) as LanguageInfo;
+    }
+
+    function getCurrentLanguageDisplayName() {
+        const currentLanguageInfo = getCurrentLanguageInfo();
+        return currentLanguageInfo.displayName;
+    }
+
+    function getDefaultCurrency(): string {
+        return t('default.currency');
+    }
+
+    function getDefaultFirstDayOfWeek(): string {
+        return t('default.firstDayOfWeek');
+    }
+
+    function getCurrencyName(currencyCode: string): string {
+        return t(`currency.name.${currencyCode}`);
+    }
+
+    function getAllMeridiemIndicators(): LocalizedMeridiemIndicator {
+        const allMeridiemIndicators = MeridiemIndicator.values();
+        const meridiemIndicatorNames = [];
+        const localizedMeridiemIndicatorNames = [];
+
+        for (let i = 0; i < allMeridiemIndicators.length; i++) {
+            const indicator = allMeridiemIndicators[i];
+
+            meridiemIndicatorNames.push(indicator.name);
+            localizedMeridiemIndicatorNames.push(t(`datetime.${indicator.name}.content`));
+        }
+
+        return {
+            values: meridiemIndicatorNames,
+            displayValues: localizedMeridiemIndicatorNames
+        };
+    }
+
+    function getAllLongMonthNames(): string[] {
+        return getAllMonthNames('long');
+    }
+
+    function getAllShortMonthNames(): string[] {
+        return getAllMonthNames('short');
+    }
+
+    function getAllLongWeekdayNames(): string[] {
+        return getAllWeekdayNames('long');
+    }
+
+    function getAllShortWeekdayNames(): string[] {
+        return getAllWeekdayNames('short');
+    }
+
+    function getAllMinWeekdayNames(): string[] {
+        return getAllWeekdayNames('min');
+    }
+
+    function setLanguage(languageKey: string | null, force?: boolean): LocaleDefaultSettings | null {
+        if (!languageKey) {
+            languageKey = getDefaultLanguage();
+            logger.info(`No specified language, use browser default language ${languageKey}`);
+        }
+
+        if (!getLanguageInfo(languageKey)) {
+            languageKey = getDefaultLanguage();
+            logger.warn(`Not found language ${languageKey}, use browser default language ${languageKey}`);
+        }
+
+        if (!force && locale.value === languageKey) {
+            logger.info(`Current locale is already ${languageKey}`);
+            return null;
+        }
+
+        logger.info(`Apply current language to ${languageKey}`);
+
+        locale.value = languageKey;
+        moment.updateLocale(languageKey, {
+            months : getAllLongMonthNames(),
+            monthsShort : getAllShortMonthNames(),
+            weekdays : getAllLongWeekdayNames(),
+            weekdaysShort : getAllShortWeekdayNames(),
+            weekdaysMin : getAllMinWeekdayNames(),
+            meridiem: function (hours) {
+                if (isPM(hours)) {
+                    return t(`datetime.${MeridiemIndicator.PM.name}.content`);
+                } else {
+                    return t(`datetime.${MeridiemIndicator.AM.name}.content`);
+                }
+            }
+        });
+
+        services.setLocale(languageKey);
+        document.querySelector('html')?.setAttribute('lang', languageKey);
+
+        const defaultCurrency = getDefaultCurrency();
+        const defaultFirstDayOfWeekName = getDefaultFirstDayOfWeek();
+        let defaultFirstDayOfWeek = WeekDay.DefaultFirstDay.type;
+
+        if (WeekDay.parse(defaultFirstDayOfWeekName)) {
+            defaultFirstDayOfWeek = WeekDay.parse(defaultFirstDayOfWeekName).type;
+        }
+
+        return {
+            currency: defaultCurrency,
+            firstDayOfWeek: defaultFirstDayOfWeek
+        };
+    }
+
+    function setTimeZone(timezone: string): void {
+        if (timezone) {
+            moment.tz.setDefault(timezone);
+        } else {
+            moment.tz.setDefault();
+        }
+    }
+
+    function initLocale(lastUserLanguage: string, timezone: string): LocaleDefaultSettings | null {
+        let localeDefaultSettings: LocaleDefaultSettings | null = null;
+
+        if (lastUserLanguage && getLanguageInfo(lastUserLanguage)) {
+            logger.info(`Last user language is ${lastUserLanguage}`);
+            localeDefaultSettings = setLanguage(lastUserLanguage, true);
+        } else {
+            localeDefaultSettings = setLanguage(null, true);
+        }
+
+        if (timezone) {
+            logger.info(`Current timezone is ${timezone}`);
+            setTimeZone(timezone);
+        } else {
+            logger.info(`No timezone is set, use browser default ${getTimezoneOffset()} (maybe ${moment.tz.guess(true)})`);
+        }
+
+        return localeDefaultSettings;
+    }
+
+    return {
+        tt: t,
+        ti: translateIf,
+        te: translateError,
+        getCurrentLanguageTag,
+        getCurrentLanguageInfo,
+        getCurrentLanguageDisplayName,
+        getDefaultCurrency,
+        getDefaultFirstDayOfWeek,
+        getCurrencyName,
+        getAllMeridiemIndicators,
+        getAllLongMonthNames,
+        getAllShortMonthNames,
+        getAllLongWeekdayNames,
+        getAllShortWeekdayNames,
+        getAllMinWeekdayNames,
+        setLanguage,
+        setTimeZone,
+        initLocale
+    };
+}
diff --git a/src/locales/index.ts b/src/locales/index.ts
index fe286f28..6b0fea44 100644
--- a/src/locales/index.ts
+++ b/src/locales/index.ts
@@ -2,7 +2,7 @@ import en from './en.json';
 import vi from './vi.json';
 import zhHans from './zh_Hans.json';
 
-interface LanguageInfo {
+export interface LanguageInfo {
     name: string;
     displayName: string;
     alternativeLanguageTag: string;
@@ -10,7 +10,7 @@ interface LanguageInfo {
     content: object;
 }
 
-export const defaultLanguage: string = 'en';
+export const DEFAULT_LANGUAGE: string = 'en';
 
 // To add new languages, please refer to https://ezbookkeeping.mayswind.net/translating
 export const allLanguages: Record<string, LanguageInfo> = {
diff --git a/src/mobile-main.js b/src/mobile-main.js
index a78c1b58..c2b2067d 100644
--- a/src/mobile-main.js
+++ b/src/mobile-main.js
@@ -80,8 +80,8 @@ import VueDatePicker from '@vuepic/vue-datepicker';
 import '@vuepic/vue-datepicker/dist/main.css';
 
 import { getVersion, getBuildTime } from '@/lib/version.ts';
+import { getI18nOptions } from '@/locales/helpers.ts';
 import {
-    getI18nOptions,
     translateIf,
     i18nFunctions
 } from '@/locales/helper.js';
diff --git a/src/stores/setting.ts b/src/stores/setting.ts
index 6a02510e..596367f9 100644
--- a/src/stores/setting.ts
+++ b/src/stores/setting.ts
@@ -144,7 +144,7 @@ export const useSettingsStore = defineStore('settings', () => {
         appSettings.value = getApplicationSettings();
     }
 
-    function updateLocalizedDefaultSettings(newLocaleDefaultSettings: LocaleDefaultSettings) {
+    function updateLocalizedDefaultSettings(newLocaleDefaultSettings: LocaleDefaultSettings | null) {
         if (!newLocaleDefaultSettings) {
             return;
         }
diff --git a/src/views/desktop/MainLayout.vue b/src/views/desktop/MainLayout.vue
index 62c2fe2d..f2bd8f95 100644
--- a/src/views/desktop/MainLayout.vue
+++ b/src/views/desktop/MainLayout.vue
@@ -5,9 +5,9 @@
             <div class="nav-header">
                 <router-link to="/" class="app-logo d-flex align-center gap-x-3 app-title-wrapper">
                     <div class="d-flex">
-                        <img alt="logo" class="main-logo" :src="ezBookkeepingLogoPath" />
+                        <img alt="logo" class="main-logo" :src="APPLICATION_LOGO_PATH" />
                     </div>
-                    <h1 class="font-weight-medium text-xl">{{ $t('global.app.title') }}</h1>
+                    <h1 class="font-weight-medium text-xl">{{ tt('global.app.title') }}</h1>
                 </router-link>
             </div>
             <perfect-scrollbar
@@ -18,82 +18,82 @@
                 <li class="nav-link home-link">
                     <router-link to="/">
                         <v-icon class="nav-item-icon" :icon="icons.overview"/>
-                        <span class="nav-item-title">{{ $t('Overview') }}</span>
+                        <span class="nav-item-title">{{ tt('Overview') }}</span>
                     </router-link>
                 </li>
                 <li class="nav-section-title">
                     <div class="title-wrapper">
-                        <span class="title-text">{{ $t('Transaction Data') }}</span>
+                        <span class="title-text">{{ tt('Transaction Data') }}</span>
                     </div>
                 </li>
                 <li class="nav-link">
                     <router-link to="/transaction/list?dateType=7">
                         <v-icon class="nav-item-icon" :icon="icons.transactions"/>
-                        <span class="nav-item-title">{{ $t('Transaction Details') }}</span>
+                        <span class="nav-item-title">{{ tt('Transaction Details') }}</span>
                     </router-link>
                 </li>
                 <li class="nav-link">
                     <router-link to="/statistics/transaction">
                         <v-icon class="nav-item-icon" :icon="icons.statistics"/>
-                        <span class="nav-item-title">{{ $t('Statistics & Analysis') }}</span>
+                        <span class="nav-item-title">{{ tt('Statistics & Analysis') }}</span>
                     </router-link>
                 </li>
                 <li class="nav-section-title">
                     <div class="title-wrapper">
-                        <span class="title-text">{{ $t('Basis Data') }}</span>
+                        <span class="title-text">{{ tt('Basis Data') }}</span>
                     </div>
                 </li>
                 <li class="nav-link">
                     <router-link to="/account/list">
                         <v-icon class="nav-item-icon" :icon="icons.accounts"/>
-                        <span class="nav-item-title">{{ $t('Accounts') }}</span>
+                        <span class="nav-item-title">{{ tt('Accounts') }}</span>
                     </router-link>
                 </li>
                 <li class="nav-link">
                     <router-link to="/category/list">
                         <v-icon class="nav-item-icon" :icon="icons.categories"/>
-                        <span class="nav-item-title">{{ $t('Transaction Categories') }}</span>
+                        <span class="nav-item-title">{{ tt('Transaction Categories') }}</span>
                     </router-link>
                 </li>
                 <li class="nav-link">
                     <router-link to="/tag/list">
                         <v-icon class="nav-item-icon" :icon="icons.tags"/>
-                        <span class="nav-item-title">{{ $t('Transaction Tags') }}</span>
+                        <span class="nav-item-title">{{ tt('Transaction Tags') }}</span>
                     </router-link>
                 </li>
                 <li class="nav-link">
                     <router-link to="/template/list">
                         <v-icon class="nav-item-icon" :icon="icons.templates"/>
-                        <span class="nav-item-title">{{ $t('Transaction Templates') }}</span>
+                        <span class="nav-item-title">{{ tt('Transaction Templates') }}</span>
                     </router-link>
                 </li>
-                <li class="nav-link" v-if="isUserScheduledTransactionEnabled">
+                <li class="nav-link" v-if="isUserScheduledTransactionEnabled()">
                     <router-link to="/schedule/list">
                         <v-icon class="nav-item-icon" :icon="icons.scheduledTransactions"/>
-                        <span class="nav-item-title">{{ $t('Scheduled Transactions') }}</span>
+                        <span class="nav-item-title">{{ tt('Scheduled Transactions') }}</span>
                     </router-link>
                 </li>
                 <li class="nav-section-title">
                     <div class="title-wrapper">
-                        <span class="title-text">{{ $t('Miscellaneous') }}</span>
+                        <span class="title-text">{{ tt('Miscellaneous') }}</span>
                     </div>
                 </li>
                 <li class="nav-link">
                     <router-link to="/exchange_rates">
                         <v-icon class="nav-item-icon" :icon="icons.exchangeRates"/>
-                        <span class="nav-item-title">{{ $t('Exchange Rates Data') }}</span>
+                        <span class="nav-item-title">{{ tt('Exchange Rates Data') }}</span>
                     </router-link>
                 </li>
                 <li class="nav-link">
                     <a href="javascript:void(0);" @click="showMobileQrCode = true">
                         <v-icon class="nav-item-icon" :icon="icons.mobile"/>
-                        <span class="nav-item-title">{{ $t('Use on Mobile Device') }}</span>
+                        <span class="nav-item-title">{{ tt('Use on Mobile Device') }}</span>
                     </a>
                 </li>
                 <li class="nav-link">
                     <router-link to="/about">
                         <v-icon class="nav-item-icon" :icon="icons.about"/>
-                        <span class="nav-item-title">{{ $t('About') }}</span>
+                        <span class="nav-item-title">{{ tt('About') }}</span>
                     </router-link>
                 </li>
             </perfect-scrollbar>
@@ -109,14 +109,14 @@
                         </v-btn>
                         <div class="app-logo d-flex align-center gap-x-3 app-title-wrapper" v-if="mdAndDown">
                             <div class="d-flex">
-                                <img alt="logo" class="main-logo" :src="ezBookkeepingLogoPath" />
+                                <img alt="logo" class="main-logo" :src="APPLICATION_LOGO_PATH" />
                             </div>
-                            <h1 class="font-weight-medium text-xl">{{ $t('global.app.title') }}</h1>
+                            <h1 class="font-weight-medium text-xl">{{ tt('global.app.title') }}</h1>
                         </div>
                         <v-spacer />
                         <v-btn color="primary" variant="text" class="me-2"
-                               :icon="true" @click="(theme === 'light' ? theme = 'dark' : (theme === 'dark' ? theme = 'auto' : theme = 'light'))">
-                            <v-icon :icon="(theme === 'light' ? icons.themeLight : (theme === 'dark' ? icons.themeDark : icons.themeAuto))" size="24" />
+                               :icon="true" @click="(currentTheme === 'light' ? currentTheme = 'dark' : (currentTheme === 'dark' ? currentTheme = 'auto' : currentTheme = 'light'))">
+                            <v-icon :icon="(currentTheme === 'light' ? icons.themeLight : (currentTheme === 'dark' ? icons.themeDark : icons.themeAuto))" size="24" />
                         </v-btn>
                         <v-avatar class="cursor-pointer" variant="tonal"
                                   :color="currentUserAvatar ? 'rgba(0,0,0,0)' : 'primary'">
@@ -152,19 +152,19 @@
                                     </v-list-item>
                                     <v-divider class="my-2"/>
                                     <v-list-item :prepend-icon="icons.profile"
-                                                 :title="$t('User Settings')"
+                                                 :title="tt('User Settings')"
                                                  to="/user/settings"></v-list-item>
                                     <v-list-item :prepend-icon="icons.settings"
-                                                 :title="$t('Application Settings')"
+                                                 :title="tt('Application Settings')"
                                                  to="/app/settings"></v-list-item>
                                     <v-divider class="my-2"/>
                                     <v-list-item :prepend-icon="icons.lock"
-                                                 :title="$t('Lock Application')"
+                                                 :title="tt('Lock Application')"
                                                  v-if="isEnableApplicationLock"
                                                  @click="lock"></v-list-item>
                                     <v-list-item :disabled="logouting"
                                                  :prepend-icon="icons.logout"
-                                                 :title="$t('Log Out')"
+                                                 :title="tt('Log Out')"
                                                  @click="logout"></v-list-item>
                                 </v-list>
                             </v-menu>
@@ -191,12 +191,17 @@
     </div>
 </template>
 
-<script>
+<script setup lang="ts">
+import SnackBar from '@/components/desktop/SnackBar.vue';
+
+import { type Ref, ref, computed, useTemplateRef } from 'vue';
+
 import { useDisplay } from 'vuetify';
 import { useTheme } from 'vuetify';
-import { useRoute } from 'vue-router';
+import { useRoute, useRouter } from 'vue-router';
+
+import { useI18n } from '@/locales/helpers.ts';
 
-import { mapStores } from 'pinia';
 import { useRootStore } from '@/stores/index.js';
 import { useSettingsStore } from '@/stores/setting.ts';
 import { useUserStore } from '@/stores/user.ts';
@@ -206,6 +211,8 @@ import { ThemeType } from '@/core/theme.ts';
 import { isUserScheduledTransactionEnabled } from '@/lib/server_settings.ts';
 import { getSystemTheme, setExpenseAndIncomeAmountColor } from '@/lib/ui/common.ts';
 
+type SnackBarType = InstanceType<typeof SnackBar>;
+
 import {
     mdiMenu,
     mdiHomeOutline,
@@ -229,124 +236,118 @@ import {
     mdiLogout
 } from '@mdi/js';
 
-export default {
-    data() {
-        return {
-            logouting: false,
-            isVerticalNavScrolled: false,
-            showVerticalOverlayMenu: false,
-            showLoading: false,
-            showMobileQrCode: false,
-            icons: {
-                menu: mdiMenu,
-                overview: mdiHomeOutline,
-                transactions: mdiListBoxOutline,
-                accounts: mdiCreditCardOutline,
-                categories: mdiViewDashboardOutline,
-                tags: mdiTagOutline,
-                templates: mdiClipboardTextOutline,
-                scheduledTransactions: mdiClipboardTextClockOutline,
-                statistics: mdiChartPieOutline,
-                exchangeRates: mdiSwapHorizontal,
-                settings: mdiCogOutline,
-                mobile: mdiCellphone,
-                about: mdiInformationOutline,
-                themeAuto: mdiThemeLightDark,
-                themeLight: mdiWeatherSunny,
-                themeDark: mdiWeatherNight,
-                user: mdiAccount,
-                profile: mdiAccountCogOutline,
-                lock: mdiLockOutline,
-                logout: mdiLogout
+const display = useDisplay();
+const theme = useTheme();
+const route = useRoute();
+const router = useRouter();
+
+const { tt, initLocale } = useI18n();
+
+const rootStore = useRootStore();
+const settingsStore = useSettingsStore();
+const userStore = useUserStore();
+
+const icons = {
+    menu: mdiMenu,
+    overview: mdiHomeOutline,
+    transactions: mdiListBoxOutline,
+    accounts: mdiCreditCardOutline,
+    categories: mdiViewDashboardOutline,
+    tags: mdiTagOutline,
+    templates: mdiClipboardTextOutline,
+    scheduledTransactions: mdiClipboardTextClockOutline,
+    statistics: mdiChartPieOutline,
+    exchangeRates: mdiSwapHorizontal,
+    settings: mdiCogOutline,
+    mobile: mdiCellphone,
+    about: mdiInformationOutline,
+    themeAuto: mdiThemeLightDark,
+    themeLight: mdiWeatherSunny,
+    themeDark: mdiWeatherNight,
+    user: mdiAccount,
+    profile: mdiAccountCogOutline,
+    lock: mdiLockOutline,
+    logout: mdiLogout
+};
+
+const snackbar = useTemplateRef<SnackBarType>('snackbar');
+
+const logouting: Ref<boolean> = ref(false);
+const isVerticalNavScrolled: Ref<boolean> = ref(false);
+const showVerticalOverlayMenu: Ref<boolean> = ref(false);
+const showLoading: Ref<boolean> = ref(false);
+const showMobileQrCode: Ref<boolean> = ref(false);
+
+const mdAndDown = computed<boolean>(() => {
+    return display.mdAndDown.value;
+});
+
+const currentRoutePath = computed<string>(() => {
+    return route.path;
+});
+
+const currentNickName = computed<string>(() => {
+    return userStore.currentUserNickname || tt('User');
+});
+
+const currentUserAvatar = computed<string | null>(() => {
+    return userStore.getUserAvatarUrl(userStore.currentUserBasicInfo, true);
+});
+
+const currentTheme = computed<string>({
+    get: () => {
+        return settingsStore.appSettings.theme;
+    },
+    set: (value: string) => {
+        if (value !== settingsStore.appSettings.theme) {
+            settingsStore.setTheme(value);
+
+            if (value === ThemeType.Light || value === ThemeType.Dark) {
+                theme.global.name.value = value;
+            } else {
+                theme.global.name.value = getSystemTheme();
             }
         }
-    },
-    computed: {
-        ...mapStores(useRootStore, useSettingsStore, useUserStore),
-        ezBookkeepingLogoPath() {
-            return APPLICATION_LOGO_PATH;
-        },
-        mdAndDown() {
-            return this.display.mdAndDown.value;
-        },
-        currentRoutePath() {
-            const route = useRoute();
-            return route.path;
-        },
-        currentNickName() {
-            return this.userStore.currentUserNickname || this.$t('User');
-        },
-        currentUserAvatar() {
-            return this.userStore.getUserAvatarUrl(this.userStore.currentUserBasicInfo, true);
-        },
-        theme: {
-            get: function () {
-                return this.settingsStore.appSettings.theme;
-            },
-            set: function (value) {
-                if (value !== this.settingsStore.appSettings.theme) {
-                    this.settingsStore.setTheme(value);
-
-                    if (value === ThemeType.Light || value === ThemeType.Dark) {
-                        this.globalTheme.global.name.value = value;
-                    } else {
-                        this.globalTheme.global.name.value = getSystemTheme();
-                    }
-                }
-            }
-        },
-        isUserScheduledTransactionEnabled() {
-            return isUserScheduledTransactionEnabled();
-        },
-        isEnableApplicationLock() {
-            return this.settingsStore.appSettings.applicationLock;
-        }
-    },
-    setup() {
-        const display = useDisplay();
-        const theme = useTheme();
-
-        return {
-            display: display,
-            globalTheme: theme
-        };
-    },
-    methods: {
-        handleNavScroll(e) {
-            this.isVerticalNavScrolled = e.target.scrollTop > 0;
-        },
-        lock() {
-            this.rootStore.lock();
-            this.$router.replace('/unlock');
-        },
-        logout() {
-            const self = this;
-
-            self.logouting = true;
-            self.showLoading = true;
-
-            self.rootStore.logout().then(() => {
-                self.logouting = false;
-                self.showLoading = false;
-
-                self.settingsStore.clearAppSettings();
-
-                const localeDefaultSettings = self.$locale.initLocale(self.userStore.currentUserLanguage, self.settingsStore.appSettings.timeZone);
-                self.settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
-
-                setExpenseAndIncomeAmountColor(self.userStore.currentUserExpenseAmountColor, self.userStore.currentUserIncomeAmountColor);
-
-                this.$router.replace('/login');
-            }).catch(error => {
-                self.logouting = false;
-                self.showLoading = false;
-
-                if (!error.processed) {
-                    self.$refs.snackbar.showError(error);
-                }
-            });
-        }
     }
+});
+
+const isEnableApplicationLock = computed<boolean>(() => {
+    return settingsStore.appSettings.applicationLock;
+});
+
+function handleNavScroll(e: Event) {
+    isVerticalNavScrolled.value = (e.target as HTMLElement).scrollTop > 0;
+}
+
+function lock() {
+    rootStore.lock();
+    router.replace('/unlock');
+}
+
+function logout() {
+    logouting.value = true;
+    showLoading.value = true;
+
+    rootStore.logout().then(() => {
+        logouting.value = false;
+        showLoading.value = false;
+
+        settingsStore.clearAppSettings();
+
+        const localeDefaultSettings = initLocale(userStore.currentUserLanguage, settingsStore.appSettings.timeZone);
+        settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
+
+        setExpenseAndIncomeAmountColor(userStore.currentUserExpenseAmountColor, userStore.currentUserIncomeAmountColor);
+
+        router.replace('/login');
+    }).catch(error => {
+        logouting.value = false;
+        showLoading.value = false;
+
+        if (!error.processed && snackbar.value) {
+            snackbar.value.showError(error);
+        }
+    });
 }
 </script>
 
diff --git a/vite.config.ts b/vite.config.ts
index 82cc44a9..d8661f90 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -180,7 +180,7 @@ export default defineConfig(() => {
                             return 'common';
                         } else if (/[\\/]src[\\/]components[\\/](base|common)[\\/]/i.test(id)) {
                             return 'common';
-                        } else if (/[\\/]src[\\/]locales[\\/]helper\.(js|ts)/i.test(id)) {
+                        } else if (/[\\/]src[\\/]locales[\\/]helpers\.(js|ts)/i.test(id)) {
                             return 'common';
                         } else if (/[\\/]src[\\/]locales[\\/]/i.test(id)) {
                             return 'locales';