add language code

src/locales/index.js

@@ -7,11 +7,13 @@ export const allLanguages = {
     'en': {
         name: 'English',
         displayName: 'English',
+        code: 'en',
         content: en
     },
     'zh-Hans': {
         name: 'Simplified Chinese',
         displayName: '简体中文',
+        code: 'zh-CN',
         aliases: ['zh-CHS', 'zh-CN', 'zh-SG'],
         content: zhHans
     }