(bug 67966) Add GENDER support for recipient

As outlined on https://translatewiki.net/wiki/Thread:Support/MediaWiki:Notification-flow-thanks/en_and_MediaWiki:Notification-flow-thanks/fr

Bug: 67966
Change-Id: Id6a52b74809acbbf23eb0d9c76b281368daed1ab
Merge "(bug 67966) Add GENDER support for recipient"