Update 2 files

- /src/i18n/languages.js
- /src/services/locale/locale.service.js

src/i18n/languages.js

@@ -17,7 +17,7 @@ const languages = [
   'ja',
   'ja_easy',
   'ko',
-  'nan',
+  'nan-TW',
   'nb',
   'nl',
   'oc',

src/services/locale/locale.service.js

@@ -19,7 +19,7 @@ const internalToBackendLocaleMulti = codes => {
 const getLanguageName = (code) => {
   const specialLanguageNames = {
     ja_easy: 'やさしいにほんご',
-    nan_TW: '臺語（閩南語）',
+    nan-TW: '臺語（閩南語）',
     zh: '简体中文',
     zh_Hant: '繁體中文'
   }