Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  d86f8b17fe911c1878640f7add0c04319e13b828

UserLanguageLookup: Only return languages we support

Right now people can, via Babel, specify languages we don't
support at all and they'll appear in the interface (but wont
work as the underlying API doesn't support these codes).

Also region codes can be uppercase right now (eg. nds-NL) while
MediaWiki (and thus our API) expects all codes in lowercase.

Change-Id: I0461a2514de01e36d299b267c3230ba6f6acd4a6