Core change I8d825eb0 begins the process of changing core database
tables from using xx_user and xx_user_text fields to using xx_actor.
This updates the extension to continue to function during and after the
transition.
Bug: T167246
Change-Id: Ic06c15c262bc47b66ace76207d77a76f46be305e
MediaWiki core change I04b1a384 added support for i18n of API module
help. This takes advantage of that while still maintaining backwards
compatibility with earlier versions of MediaWiki.
Once support for MediaWiki before 1.25 is dropped, the methods marked
deprecated in this patch may be removed.
Change-Id: I67395aff48185f3e09da31b51a08aa2541fe6a17