Fixing system language is not in all languages

- Seperate System language and app language logic to different
  controller

- Fixing system langauge only show in suggested langage and not show in
  all languages.

Bug: 228596568
Test: set system/app languages
Change-Id: I3b7ab0a78a77a71794dfd4a59c807637fb7b912d
Merged-In: I3b7ab0a78a77a71794dfd4a59c807637fb7b912d