feat: add language ja_JP

lib/lang.js

@@ -4,6 +4,7 @@ import zhHK from './lang/zh-HK'
 import zhTW from './lang/zh-TW'
 import frFR from './lang/fr-FR'
 import trTR from './lang/tr-TR'
+import jaJP from './lang/ja-JP'
 import cookie from 'react-cookies'
 import { getQueryVariable, isBrowser, mergeDeep } from './utils'
 
@@ -13,7 +14,8 @@ const lang = {
   'zh-HK': zhHK,
   'zh-TW': zhTW,
   'fr-FR': frFR,
-  'tr-TR': trTR
+  'tr-TR': trTR,
+  'ja-JP': jaJP
 }
 
 export default lang
@@ -42,6 +44,8 @@ export function generateLocaleDict(langString) {
     case 'tr-tr':
       userLocale = lang['tr-TR']
       break
+    case 'ja-jp':
+      userLocale = lang['ja-JP']
     default:
       userLocale = lang['en-US']
   }