Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  a5769bcd63eda422b2398be054797f3349118193
null
(hot fix) fixes broken 'add' button introduced in I14e89ecc

Will probably require Ia6a7ee90 for nice disabling during save. Can be merged before though, since
the call to jQuery.Widget.option() will always work.

Change-Id: Ia779c93bb18fdac763ce569ecc3286ab932f5043