The error messages are not user-friendly and don't follow i18n translations

[Francesco146]

Describe the bug

The error message that is shown to the end user, which occurs at the abrupt stop of an established connection, contains the type of exception generated at runtime. it would be better to show only the content of the message to have a more user-friendly behavior. Also, it would be better to add the most common errors in the i18n translation files, currently they do not follow the system language.

To reproduce

1. Start a sharing connection
2. Stop it before it finishes
3. Click on the error to see the details
4. See error

Expected behavior

The error should be more user friendly, not including the DioException [request cancelled] part.

Screenshots

Desktop (please complete the following information)

All OS/versions are affected

Smartphone (please complete the following information)

All OS/versions are affected

Additional context

This might be where the changes are needed:

https://github.com/localsend/localsend/blob/8f652cf5696ac1660f4fac6f36f85e28b14ab236/app/lib/provider/network/send_provider.dart#L442C1-L458C2

// app/lib/provider/network/send_provider.dart:442
extension on Object {
  String get humanErrorMessage {
    final e = this;
    if (e is DioException && e.response != null) {
      final body = e.response!.data;
      String message;
      try {
        message = (body as Map)['message'];
      } catch (_) {
        message = body;
      }
      return '[${e.response!.statusCode}] $message';
    }

    return e.toString();
  }
}