All API calls supports the generic parameter variant.
With I8a31dfd3cf2a3e8f768907084d26a77f198ccbe3 in core this parameter
is documented and generates no warning anymore.
Bug: T117529
Change-Id: Ic7e6f1df99c67ad4132c22503d99345611af271a
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