Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  8007203aac21f23e21372e2c04319347e450ed0a

Add additional css classes to toolbarbuttons

This will allow us to access buttons with way less
complicated selectors or xpaths in selenium tests

Change-Id: Iea5393d06e8c0abb8e19456674e7f62f88c433f3