Use language name for sort order instead of identifier. Fix a few outdated comments.
Use language name for sort order instead of identifier. Fix a few outdated comments.

Issue: #3955

Auditors: @bbondy, @alexwykoff

Test Plan:

  i. Open about:preferences
  ii. Ensure language are in alphabetical order in select

pmkary/braver,jonathansampson/browser-laptop,willy-b/browser-laptop,diasdavid/browser-laptop,Sh1d0w/browser-laptop,Sh1d0w/browser-laptop,timborden/browser-laptop,timborden/browser-laptop,dcposch/browser-laptop,diasdavid/browser-laptop,willy-b/browser-laptop,luixxiul/browser-laptop,MKuenzi/browser-laptop,darkdh/browser-laptop,jonathansampson/browser-laptop,Sh1d0w/browser-laptop,Sh1d0w/browser-laptop,MKuenzi/browser-laptop,luixxiul/browser-laptop,diasdavid/browser-laptop,timborden/browser-laptop,willy-b/browser-laptop,darkdh/browser-laptop,willy-b/browser-laptop,dcposch/browser-laptop,MKuenzi/browser-laptop,pmkary/braver,dcposch/browser-laptop,diasdavid/browser-laptop,jonathansampson/browser-laptop,timborden/browser-laptop,jonathansampson/browser-laptop,MKuenzi/browser-laptop,pmkary/braver,darkdh/browser-laptop,darkdh/browser-laptop,luixxiul/browser-laptop,luixxiul/browser-laptop,dcposch/browser-laptop,pmkary/braver