[Panlingual] Improve UI can not show on at first.

  - Settings take much time to get the info of app launcher entry. User
    may not see the panlingual UI at first after boot to home.
  - Does small refactor to somewhere.

Bug: 218416193
Test: local
Test: atest pass
Change-Id: Ibfb91f0bb8d8ff54cadd041250b3cff252dbe591
(cherry picked from commit cae20ce2)
Merged-In: Ibfb91f0bb8d8ff54cadd041250b3cff252dbe591