fix: brazillian localle bug that makes app unresponsive

lib/entities/language_service.dart

@@ -1,7 +1,20 @@
 import 'package:cake_wallet/generated/locales.dart';
 import 'package:devicelocale/devicelocale.dart';
+import "package:flutter/widgets.dart";
 import 'package:intl/intl.dart';
 
+// This will turn stored language code into Flutter Locale.
+// Some of our language codes uses an underscore (like "pt_BR") and this must be split into language
+// and country subtags, if we pass the whole string as the languageCode, GlobalMaterialLocalizations
+// would reject it as an invalid ISO 639-1 code and crash the app on locale switch
+Locale localeFromLanguageCode(String code) {
+  final parts = code.split("_");
+  if (parts.length == 2 && parts[0].isNotEmpty && parts[1].isNotEmpty) {
+    return Locale(parts[0], parts[1]);
+  }
+  return Locale(code);
+}
+
 class LanguageService {
   static const Map<String, String> supportedLocales = {
     'en': 'English',

lib/main.dart

@@ -426,7 +426,7 @@ class AppState extends State<App> with SingleTickerProviderStateMixin {
               themeMode: themeMode,
               localizationsDelegates: localizationDelegates,
               supportedLocales: S.delegate.supportedLocales,
-              locale: Locale(appStore.settingsStore.languageCode),
+              locale: localeFromLanguageCode(appStore.settingsStore.languageCode),
               onGenerateRoute: (settings) => Router.createRoute(settings),
               initialRoute: initialRoute,
               scrollBehavior: AppScrollBehavior(),

tool/generate_localization.dart

@@ -1,6 +1,5 @@
 import 'dart:io';
 import 'dart:convert';
-import './print_verbose_dummy.dart';
 
 import 'localization/localization_constants.dart';
 import 'utils/utils.dart';
@@ -49,7 +48,7 @@ Future<void> main(List<String> args) async {
       return;
     }
 
-    final localePath = <String, dynamic>{};
+    final arbFiles = <String, dynamic>{};
     await dir.list(recursive: false).forEach((element) {
       // Parse the locale from the file name (e.g. strings_pt_br.arb -> pt_BR),
       // normalizing the case so keys match LanguageService.supportedLocales.
@@ -63,9 +62,12 @@ Future<void> main(List<String> args) async {
       final locale = parts.length > 1
           ? '${parts.first.toLowerCase()}_${parts.sublist(1).join('_').toUpperCase()}'
           : parts.first.toLowerCase();
-      localePath[locale] = element.path;
+      arbFiles[locale] = element.path;
     });
 
+    final sortedLocales = arbFiles.keys.toList()..sort();
+    final localePath = <String, dynamic>{for (final key in sortedLocales) key: arbFiles[key]};
+
     if (!localePath.keys.contains(defaultLocale)) {
       print("Locale list doesn't contain $defaultLocale");
       return;
@@ -103,8 +105,14 @@ Future<void> main(List<String> args) async {
 
       output += classDeclaration;
 
+      // for handling keys like pt_BR so entry becomes Locale("pt", "BR") and doesn't crash app
       localePath.keys.forEach((key) {
-        output += '      Locale("$key", ""),' + '\n';
+        final parts = key.split("_");
+        if (parts.length == 2) {
+          output += "      Locale(\"${parts[0]}\", \"${parts[1]}\"),\n";
+        } else {
+          output += "      Locale(\"$key\", \"\"),\n";
+        }
       });
 
       output += part2;