title: Localization of app in language that is not in "Language" list in Settings.app
body: <p>Here is my issue:</p>
  
  <p><img src="https://i.stack.imgur.com/MWdDn.png" alt="enter image description here"></p>
  
  <p>I have 2 localizations - for English and for Bulgarian. I can't load Bulgarian languages, because it's not in "Language" list, and English is loaded even though the Region Format is set to "Bulgaria".</p>
  
  <p>Is there a way to open my app with my bulgarian localization files or not?</p>