refactor: improve locale parsing and normalization in localization ge… (#3330)

* refactor: improve locale parsing and normalization in localization generation script

* Remove chinese tranditional because it's breaking flutter

* delete retry in case of parallel save [skip ci]

* Improve translation

tool/generate_localization.dart

@@ -51,12 +51,19 @@ Future<void> main(List<String> args) async {
 
     final localePath = <String, dynamic>{};
     await dir.list(recursive: false).forEach((element) {
-      try {
-        final shortLocale = element.path.split('_',)[1].split('.')[0];
-        localePath[shortLocale] = element.path;
-      } catch (e) {
+      // Parse the locale from the file name (e.g. strings_pt_br.arb -> pt_BR),
+      // normalizing the case so keys match LanguageService.supportedLocales.
+      final fileName = element.uri.pathSegments.last;
+      if (!fileName.startsWith('strings_') || !fileName.endsWith('.arb')) {
         printV('Wrong file: ${element.path}');
+        return;
       }
+      final parts =
+        fileName.substring('strings_'.length, fileName.length - '.arb'.length).split('_');
+      final locale = parts.length > 1
+        ? '${parts.first.toLowerCase()}_${parts.sublist(1).join('_').toUpperCase()}'
+        : parts.first.toLowerCase();
+      localePath[locale] = element.path;
     });
 
     if (!localePath.keys.contains(defaultLocale)) {

tool/utils/translation/translation_constants.dart

@@ -2,5 +2,5 @@ const defaultLang = "en";
 const langs = [
   "ar", "bg", "cs", "de", "en", "es", "fa", "fr", "gn", "ha", "hi", "hr", "hy", "id", "it",
   "ja", "ko", "my", "nl", "pl", "pt", "ru", "th", "tl", "tr", "uk", "ur", "yo",
-  "vi", "zh-cn", "zh-tw" // zh-cn for Chinese (Simplified), zh-tw for Chinese (Traditional)
+  "vi", "zh-cn" // zh-cn for Chinese (Simplified)
 ];