[Bug] Translations falling back to wrong .resx file

[Phil108]

Description

Translations ignoring fallback rules for resx-files and select the en-US version by error.

Steps to Reproduce

1. Add these translation files to your project Translations.resx, Translations.en.resx (optional), Translations.en-US.resx, Translations.en-GB.resx

• For iOS set your Phone's region to "Lithuania", your language to "English (UK)" and delete all languages from the list of preferred languages
• For Android select "English" as device language and region to "Netherlands"

3. Retrieve a translation

Expected Behavior

• According to the documentation for using resx-files for translations with Xamarin.Forms:
  ** For iOS Translations.en-GB.resx shall be selected.
  ** For Android, if Translations.en.resx is present, a translation should be selected from this file, otherwise from Translations.resx

Actual Behavior

• Translations from Translations.en-US.resx are used

Basic Information

• Version with issue: 4.8.0.1687
• Platform Target Frameworks:
  ** iOS: 14.2
  ** Android: 11

Screenshots

Example Code

RESXTEST.zip

Workaround

• Implement fallback mechanism oneself and transition whole codebase