Add japanese

src/locales/index.ts

@@ -4,6 +4,7 @@ import es from './es.json';
 import vi from './vi.json';
 import zhHans from './zh_Hans.json';
 import de from './de.json';
+import ja from './ja.json';
 
 export interface LanguageInfo {
     readonly name: string;
@@ -40,6 +41,12 @@ export const ALL_LANGUAGES: Record<string, LanguageInfo> = {
         alternativeLanguageTag: 'es',
         content: es
     },
+    'ja': {
+        name: 'Japanese',
+        displayName: 'Japanese',
+        alternativeLanguageTag: 'ja-JP',
+        content: ja
+    },
     'ru': {
         name: 'Russian',
         displayName: 'Русский',