Add explicit GENDER support for 'revertpage-nouser'

Requested in https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Revertpage-nouser/en

Change-Id: I56d6d6186c1b2f36eff8c43574f2382a927d805f
Merge "Add explicit GENDER support for 'revertpage-nouser'"