fix(mobile): chinese translation (#18491)

* fix: Chinese translation

* using Locale.fromsubtags

Author: alextran1502

mobile/lib/constants/locales.dart

@@ -6,8 +6,10 @@ const Map<String, Locale> locales = {
   // Additional locales
   'Arabic (ar)': Locale('ar'),
   'Catalan (ca)': Locale('ca'),
-  'Chinese Simplified (zh_CN)': Locale('zh', 'CN'),
-  'Chinese Traditional (zh_TW)': Locale('zh', 'TW'),
+  'Chinese Simplified (zh_CN)':
+      Locale.fromSubtags(languageCode: 'zh', scriptCode: 'SIMPLIFIED'),
+  'Chinese Traditional (zh_TW)':
+      Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant'),
   'Czech (cs)': Locale('cs'),
   'Danish (da)': Locale('da'),
   'Dutch (nl)': Locale('nl'),