There are no translations in 'en_' for key

[IchordeDionysos]

The locale en_ does not get mapped onto en locale.

So when the local is en_, then with the translations from below it will throw the error:

➜ There are no translations in 'en_' for "not_found".

import 'package:i18n_extension/i18n_extension.dart';

extension Localization on String {

  static var t = Translations.byLocale("de") +
      {
        "en": {
          "not_found": "404 not found",
        },
        "de": {
          "not_found": "404 nicht gefunden",
        },
      };

  String get i18n => localize(this, t);
}

[marcglasberg]

Ok, I can remove the _ and turn en_ into en. Easy fix, but, a question: isn't en_ a malformed Locale? Do you know the link to the Locale specification?

[IchordeDionysos]

@marcglasberg I did some research 🤔
In the dart documentation the method Locale.toString() they say:

it is intended to be used for debugging purposes only. For parseable results, use toLanguageTag instead.

However, in this package locale.toString() is used.

I was not sure if this was the problem so I did some debugging and found out that:
Locale("en") is okay and will output "en",
Locale("en", "") is not okay and will output "en_", ...

A bit more info: This happens on my iOS Simulator 🤔

As this seems to be at the root a Flutter issue, I opened one over there.
flutter/flutter#43607

[marcglasberg]

In any case it now removes extra spaces and "_", so this should be fixed.