Issue #2285101 by Berdir: Fixed Plugin managers no longer need the language manager.
Issue #2208979 by andypost, pcambra: Comment module fixes.
Issue #2287169 by pcambra: Move the config to the new structure.
Issue #2287143 by pcambra: Fix Devel tests.
Issue #2285693 by ivanjaros: Fixed DevelSwitchUser uses drupal_add_css.
Issue #2285689 by ivanjaros: Fixed Undefined variable user in devel.module.