Add Japanese support (infiniflow#3906)

### What problem does this PR solve?

Add native translation in locales for Japanese 🇯🇵 to support new local
language



### Type of change

- [x] New Feature (non-breaking change which adds functionality)

Co-authored-by: Hiroshi Kameya <kameya_h@sunflare.co.jp>

web/src/constants/common.ts

@@ -46,6 +46,7 @@ export const LanguageList = [
   'Indonesia',
   'Spanish',
   'Vietnamese',
+  'Japanese',
 ];
 
 export const LanguageMap = {
@@ -55,6 +56,7 @@ export const LanguageMap = {
   Indonesia: 'Indonesia',
   Spanish: 'Español',
   Vietnamese: 'Tiếng việt',
+  Japanese: '日本語',
 };
 
 export const LanguageTranslationMap = {
@@ -64,6 +66,7 @@ export const LanguageTranslationMap = {
   Indonesia: 'id',
   Spanish: 'es',
   Vietnamese: 'vi',
+  Japanese: 'ja',
 };
 
 export enum FileMimeType {

web/src/locales/config.ts

@@ -5,6 +5,7 @@ import { initReactI18next } from 'react-i18next';
 import translation_en from './en';
 import translation_es from './es';
 import translation_id from './id';
+import translation_ja from './ja';
 import translation_vi from './vi';
 import translation_zh from './zh';
 import translation_zh_traditional from './zh-traditional';
@@ -14,6 +15,7 @@ const resources = {
   zh: translation_zh,
   'zh-TRADITIONAL': translation_zh_traditional,
   id: translation_id,
+  ja: translation_ja,
   es: translation_es,
   vi: translation_vi,
 };
@@ -25,7 +27,7 @@ i18n
     detection: {
       lookupLocalStorage: 'lng',
     },
-    supportedLngs: ['en', 'zh', 'zh-TRADITIONAL', 'id', 'es', 'vi'],
+    supportedLngs: ['en', 'zh', 'zh-TRADITIONAL', 'id', 'es', 'vi', 'ja'],
     resources,
     fallbackLng: 'en',
     interpolation: {