Add a few missing `@group Language` tags as well.
Remove stray `@group Cache` from two classes since "Cache" is not a
MediaWiki core component (per T248519 and related tasks, we did long
ago in Bugzilla have a "MediaWiki-Cache" category, but that's since
been re-orged into BagOStuff, HTTP-Cache, and Parser/ParserCache,
and Internationalization/LocalisationCache, per the description at
<https://phabricator.wikimedia.org/project/profile/1329/>.)
Ref https://gerrit.wikimedia.org/r/q/owner:Krinkle+is:merged+message:Widen
> Given all called methods are de-facto and liberally claimed, and
> that we keep the coverage limited to the subject class, it maintains
> the spirit and intent by listing the class explicitly instead.
>
> PHPUnit offers a more precise tool when you need it (i.e. when testing
> legacy monster/god classes), but for well-written code, the
> class-wide tag is exactly what you want.
>
> We lose useful coverage and waste valuable time on keeping tags
> accurate through refactors (or worse, forget to do so).
> Tracking tiny per-method details wastes time in realizing (and
> fixing) when people inevitably don't keep them in sync, and time
> lost in finding uncovered code to write tests to realize it was
> already covered but "not yet claimed".
Bug: T364652
Change-Id: I9cfc4c210b90bfed6fd988a2525f80f5f5ee4870
This replaces the static Language methods getFallbackFor(),
getFallbacksFor(), and getFallbacksIncludingSiteLanguage(). There is
100% unit and integration test coverage for the new class.
One deliberate functional change: I changed one place where we threw
MWException to InvalidArgumentException.
Bug: T201405
Depends-On: Ie7a89f6ed7d52a0bc01672019ff92e7ee105a1f3
Change-Id: I49222eb55f1feec5b1dcd40f364cffe0c8801855
