support turning on dark theme manually

src/locales/en.js

@@ -934,6 +934,9 @@ export default {
     'Filter Transaction Categories': 'Filter Transaction Categories',
     'User Profile': 'User Profile',
     'Language': 'Language',
+    'Theme': 'Theme',
+    'Light': 'Light',
+    'Dark': 'Dark',
     'Timezone': 'Timezone',
     'System Default': 'System Default',
     'Language Default': 'Language Default',
@@ -948,7 +951,6 @@ export default {
     'Show Account Balance': 'Show Account Balance',
     'Show Total Amount In Transaction List Page': 'Show Total Amount In Transaction List Page',
     'Enable Animate': 'Enable Animate',
-    'Enable Auto Dark Mode': 'Enable Auto Dark Mode',
     'Use preset transaction categories': 'Use preset transaction categories',
     'Preset Categories': 'Preset Categories',
     'You have been successfully registered': 'You have been successfully registered',