Updated mediawiki/extensions
Project: mediawiki/extensions/UniversalLanguageSelector  dfbae630a5dd2b59f8afa63a83b160445c04162c
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Add 'ar' as a language supported by the Amiri font

It is used as the default in the Arabic Wikipedia, so it should be
used in jquery.webfonts, too.

Change-Id: I862e313add75e494fce9e85172b3b9ce869f3716