Refactor language codes in i18n and update language selection in settings

Author: rtugeek

src/i18n/i18n.ts

@@ -9,12 +9,12 @@ import trayZh from '@/i18n/tray/zh.json'
 export const i18n = createI18n({
   locale: 'zh',
   messages: {
-    'zh': {
+    zh: {
       ...defaultZh,
       settings: settingsZh,
       tray: trayZh,
     },
-    'en-US': {
+    en: {
       ...defaultEn,
       settings: settingsEn,
       tray: trayEn,

src/views/settings/SettingView.vue

@@ -55,7 +55,7 @@ const languages: Language[] = [
               </el-form-item>
               <el-form-item :label="t('settings.language')">
                 <el-select v-model="languageCode">
-                  <el-option v-for="lang in languages" :key="lang.baseName" :value="lang.baseName" :label="lang.nativeName" />
+                  <el-option v-for="lang in languages" :key="lang.baseName" :value="lang.language" :label="lang.nativeName" />
                 </el-select>
               </el-form-item>
               <el-form-item v-if="debugMode" :label="t('settings.developerMode')">