Last modified: 2013-04-26 17:54:57 UTC
Needed as some languages need to indicate the gender of the thanked user. Spotted by Toliño on https://translatewiki.net/wiki/Thread:Translating_talk:MediaWiki/About_MediaWiki:Thanks-thanked/en
See http://www.mediawiki.org/wiki/Manual:Messages_API#JavaScript_examples for implementation hints.