feat: add support for Simplified Chinese 🇨🇳

lib/core/settings/domain/settings_entity.dart

@@ -48,7 +48,8 @@ enum Language {
   russian('ru', 'RU', 'Русский'),
   german('de', 'DE', 'Deutsch'),
   italian('it', 'IT', 'Italiano'),
-  portuguese('pt', 'PT', 'Português');
+  portuguese('pt', 'PT', 'Português'),
+  simplifiedChinese('zh', 'CN', '简体中文');
 
   final String languageCode;
   final String? countryCode;

lib/features/bip329_labels/page.dart

@@ -43,13 +43,21 @@ class Bip329LabelsPage extends StatelessWidget {
                 exportSuccess: (labelsCount) {
                   SnackBarUtils.showSnackBar(
                     context,
-                    context.loc.bip329LabelsExportSuccess(labelsCount),
+                    labelsCount == 1
+                        ? context.loc.bip329LabelsExportSuccessSingular
+                        : context.loc.bip329LabelsExportSuccessPlural(
+                            labelsCount,
+                          ),
                   );
                 },
                 importSuccess: (labelsCount) {
                   SnackBarUtils.showSnackBar(
                     context,
-                    context.loc.bip329LabelsImportSuccess(labelsCount),
+                    labelsCount == 1
+                        ? context.loc.bip329LabelsImportSuccessSingular
+                        : context.loc.bip329LabelsImportSuccessPlural(
+                            labelsCount,
+                          ),
                   );
                 },
                 error: (message) {

lib/features/onboarding/ui/screens/advanced_options.dart

@@ -7,6 +7,7 @@ import 'package:bb_mobile/core/widgets/settings_entry_item.dart';
 import 'package:bb_mobile/features/electrum_settings/frameworks/ui/routing/electrum_settings_router.dart';
 import 'package:bb_mobile/features/recoverbull/ui/pages/settings_page.dart';
 import 'package:bb_mobile/features/settings/presentation/bloc/settings_cubit.dart';
+import 'package:bb_mobile/features/settings/ui/widgets/translation_warning_bottom_sheet.dart';
 import 'package:bb_mobile/features/tor_settings/presentation/bloc/tor_settings_cubit.dart';
 import 'package:bb_mobile/features/tor_settings/ui/widgets/tor_proxy_widget.dart';
 import 'package:flutter/material.dart';
@@ -102,6 +103,9 @@ class _AdvancedOptionsState extends State<AdvancedOptions> {
                               context.read<SettingsCubit>().changeLanguage(
                                 newLanguage,
                               );
+                              if (newLanguage != Language.unitedStatesEnglish) {
+                                TranslationWarningBottomSheet.show(context);
+                              }
                             }
                           },
                         ),

lib/features/settings/ui/screens/app_settings/app_settings_screen.dart

@@ -4,6 +4,7 @@ import 'package:bb_mobile/core/widgets/settings_entry_item.dart';
 import 'package:bb_mobile/features/settings/presentation/bloc/settings_cubit.dart';
 import 'package:bb_mobile/features/settings/ui/settings_router.dart';
 import 'package:bb_mobile/features/settings/ui/widgets/dev_mode_switch.dart';
+import 'package:bb_mobile/features/settings/ui/widgets/translation_warning_bottom_sheet.dart';
 import 'package:bb_mobile/features/tor_settings/ui/tor_settings_router.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
@@ -49,6 +50,9 @@ class AppSettingsScreen extends StatelessWidget {
                         context.read<SettingsCubit>().changeLanguage(
                           newLanguage,
                         );
+                        if (newLanguage != Language.unitedStatesEnglish) {
+                          TranslationWarningBottomSheet.show(context);
+                        }
                       }
                     },
                   ),

lib/features/settings/ui/widgets/translation_warning_bottom_sheet.dart

@@ -0,0 +1,87 @@
+import 'package:bb_mobile/core/themes/app_theme.dart';
+import 'package:bb_mobile/core/utils/build_context_x.dart';
+import 'package:bb_mobile/core/widgets/bottom_sheet/x.dart';
+import 'package:bb_mobile/core/widgets/buttons/button.dart';
+import 'package:bb_mobile/core/widgets/text/text.dart';
+import 'package:flutter/material.dart';
+import 'package:url_launcher/url_launcher.dart';
+
+class TranslationWarningBottomSheet extends StatelessWidget {
+  const TranslationWarningBottomSheet({super.key});
+
+  static const String _weblateUrl = 'https://hosted.weblate.org/engage/bull/';
+  static bool _hasBeenShown = false;
+
+  static Future<void> show(BuildContext context) {
+    if (_hasBeenShown) return Future.value();
+    _hasBeenShown = true;
+
+    return BlurredBottomSheet.show(
+      context: context,
+      child: const TranslationWarningBottomSheet(),
+    );
+  }
+
+  Future<void> _openWeblate() async {
+    final url = Uri.parse(_weblateUrl);
+    await launchUrl(url, mode: LaunchMode.externalApplication);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      decoration: const BoxDecoration(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(16)),
+      ),
+      child: SafeArea(
+        child: Padding(
+          padding: const EdgeInsets.all(24),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              Container(
+                width: 40,
+                height: 4,
+                decoration: BoxDecoration(
+                  color: context.appColors.outline.withValues(alpha: 0.3),
+                  borderRadius: BorderRadius.circular(2),
+                ),
+              ),
+              const SizedBox(height: 24),
+              Icon(Icons.translate, size: 48, color: context.appColors.primary),
+              const SizedBox(height: 16),
+              BBText(
+                context.loc.translationWarningTitle,
+                style: context.font.headlineSmall?.copyWith(
+                  fontWeight: FontWeight.bold,
+                ),
+                textAlign: TextAlign.center,
+              ),
+              const SizedBox(height: 8),
+              BBText(
+                context.loc.translationWarningDescription,
+                style: context.font.bodyMedium?.copyWith(
+                  color: context.appColors.secondary.withValues(alpha: 0.7),
+                ),
+                textAlign: TextAlign.center,
+                maxLines: 6,
+                overflow: TextOverflow.ellipsis,
+              ),
+              const SizedBox(height: 24),
+
+              BBButton.big(
+                label: context.loc.translationWarningContributeButton,
+                onPressed: () async {
+                  Navigator.of(context).pop();
+                  await _openWeblate();
+                },
+                bgColor: context.appColors.secondary,
+                textColor: context.appColors.onSecondary,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}