"Close" button

Originally reported here: https://stackoverflow.com/questions/59487887/flutter-cupertino-app-close-button-not-translated

Reproduced Below:

I am writing an iOS App with Cupertino Style in flutter.

The app should be available in English and German. I am using the following translation delegates in the CupertinoApp:

  RefreshLocalizations.delegate,
  GlobalCupertinoLocalizations.delegate,
  GlobalWidgetsLocalizations.delegate,
  GlobalMaterialLocalizations.delegate,

Unfortunately, the "Close" button in the CupertinoNavigationBar is not not translated.

Why? And how can I change this?

"Back" button

"Cancel" button

Introduced by #159120