main,dart

...
        return MaterialApp(
          title: Config.app_title,
          theme: context.watch<SettingsCubit>().lightTheme == true ? CustomTheme.lightTheme : CustomTheme.darkTheme,
          home: MyHomePage(title: '${Config.app_title}'),
          onGenerateRoute: RouteGenerator.generateRoute,
          supportedLocales: [
            const Locale('en', 'US'),
            const Locale('pt', 'BR'),
          ],
          localizationsDelegates: [
            AppLocalizations.delegate,
            GlobalCupertinoLocalizations.delegate,
            GlobalMaterialLocalizations.delegate,
            GlobalWidgetsLocalizations.delegate,
          ],
          localeResolutionCallback: (locale, supportedLocales) {
            for (var supportedLocale in supportedLocales) {
              if (supportedLocale.languageCode == locale.languageCode &&
                  supportedLocale.countryCode == locale.countryCode) {
                currentLanguage = supportedLocale.toString();
                return supportedLocale;
              }
            }
            return supportedLocales.first;
          },
          debugShowCheckedModeBanner: false,
        );
...