fix new version applocalization

covas_mobile_old/lib/locale_provider.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class LocaleProvider with ChangeNotifier {
+  static const _localeKey = 'locale_code';
+
+  Locale _locale = const Locale('en');
+
+  Locale get locale => _locale;
+
+  LocaleProvider() {
+    _loadLocale();
+  }
+
+  Future<void> _loadLocale() async {
+    final prefs = await SharedPreferences.getInstance();
+    final code = prefs.getString(_localeKey);
+    if (code != null && L10n.all.contains(Locale(code))) {
+      _locale = Locale(code);
+      notifyListeners();
+    }
+  }
+
+  void setLocale(Locale locale) async {
+    if (!L10n.all.contains(locale)) return;
+
+    _locale = locale;
+    notifyListeners();
+
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_localeKey, locale.languageCode);
+  }
+}
+
+class L10n {
+  static final all = [
+    const Locale('en'),
+    const Locale('fr'),
+    const Locale('de')
+  ];
+}