Remove unused use statements

Change-Id: I7f4ff875155e40acf0a6d673e328c58325b3bea3
Merge branch 'master' of ssh://review/mediawiki/extensions/Wikibase
Remove some clutter from EntityDataRequestHandlerTest

Change-Id: I7fd6fe3f099550d8c5df5fbf92cefdd7ea2f51bd
Localisation updates from https://translatewiki.net.

Change-Id: Ic4a46c950ef0c26e8a503e8b82df6e96e36eb7cd