i18n: Add missing explicit GENDER parameter

Spotted by Mormegil at
https://translatewiki.net/wiki/Thread:Support/
  About_MediaWiki:Mobile-frontend-profile-last-thanked/cs

Change-Id: I6f1c8c36f9b39c7bf2b7bc6318c829d72d716284
Merge "i18n: Add missing explicit GENDER parameter"