您必须传递应用本地化。例如，在Cubits中，您可以执行以下操作：
main.dart

runApp(
 MaterialApp(
  localizationsDelegates: [
    AppLocalizations.delegate,
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate,
    GlobalCupertinoLocalizations.delegate,
  ],
  supportedLocales: [
    const Locale('en', ''),
    const Locale('pl', ''),
  ],
  title: 'MySuperApp',
  debugShowCheckedModeBanner: false,
  theme: ThemeData(
    primarySwatch: Colors.orange,
    accentColor: Colors.deepOrangeAccent,
    visualDensity: VisualDensity.adaptivePlatformDensity,
  ),
  initialRoute: '/',
  routes: {
    UserAuthScreen.routeName: (context) => const UserAuthScreen(),
    HomePage.routeName: (context) => HomePage(),
    ...
  }, 
  builder: (context, child) {
    final appLocalizations = AppLocalizations.of(context); //IMPORTANT
    return MultiBlocProvider(
      providers: [
        BlocProvider<ConstantsCubit>(
          lazy: true,
          create: (context) => ConstantsCubit(
            constantsRepository: ConstantsRepository(),
          ),
        ),
        BlocProvider<UserAuthCubit>(
          lazy: true,
          create: (context) => UserAuthCubit(
            localizations: appLocalizations, //THIS IS WHERE THE MAGIC HAPPENS
            repository: UserAuthRepository(),
          ),
        ),
        BlocProvider<DoerInfoCubit>(
            lazy: true,
            create: (context) => DoerInfoCubit(
                  doerInfoRepository: DoerInfoRepository(),
                  userAuthCubit: BlocProvider.of<UserAuthCubit>(context),
                )),
        ...
      ],
      child: child,
    );
  },
  home:
      BlocBuilder<UserAuthCubit, UserAuthState>(builder: (context, state) {
    if (state is UserAuthLogged) {
      return HomePage();
    } else {
      return const UserAuthScreen();
    }
  }),
),
);

在你的块或肘中：

class UserAuthCubit extends Cubit<UserAuthState> {
 final UserAuthRepository repository;
 final AppLocalizations localizations; 

 UserAuthCubit({
   @required this.repository,
   @required this.localizations,
 }) : super(const UserAuthInitial()) {
   getUserAuthState();
 }