Added Simplified Chinese translation zh-CN (Issue #571)

frontend/src/i18n/index.ts

@@ -9,6 +9,7 @@ import fr from './locales/fr';
 import ja from './locales/ja';
 import it from './locales/it';
 import ptBR from './locales/pt-BR';
+import zhCN from './locales/zh-CN';
 
 const resources = {
   en: { translation: en },
@@ -17,6 +18,7 @@ const resources = {
   ja: { translation: ja },
   it: { translation: it },
   'pt-BR': { translation: ptBR },
+  'zh-CN': { translation: zhCN },
 };
 
 i18n
@@ -25,7 +27,7 @@ i18n
   .init({
     resources,
     fallbackLng: 'en',
-    supportedLngs: ['en', 'de', 'fr', 'ja', 'it', 'pt-BR'],
+    supportedLngs: ['en', 'de', 'fr', 'ja', 'it', 'pt-BR', 'zh-CN'],
 
     detection: {
       // Order of detection methods
@@ -55,4 +57,5 @@ export const availableLanguages = [
   { code: 'ja', name: 'Japanese', nativeName: '日本語' },
   { code: 'it', name: 'Italian', nativeName: 'Italiano' },
   { code: 'pt-BR', name: 'Portuguese (Brazil)', nativeName: 'Português (Brasil)' },
+  { code: 'zh-CN', name: 'Chinese (Simplified)', nativeName: '简体中文' },
 ];