Updated mediawiki/extensions
Project: mediawiki/extensions/MediaWikiChat  78caedd03148a29493da3814a612a0ec24af3476

Consistency tweaks, round 2

* Add PLURAL
* Fix UTF-8 encodig

PS2: Per Siebrans's CR
PS3: Add mediawiki.jqueryMsg dependency for PLURAL to work

Change-Id: I0d7fefe0a82ca07bc2ccfdd03862881329f1463f