Consistency tweaks in preparatation for adding extension to translatewiki.net

* Sort language arrays: 1st: 'en', 2nd: 'qqq', 3rd....: translations
* Normalize description message
* Add FIXMEs
* Delete/fix wrong German translations
* Add messages for new user groups and rights
* Add passing of user gender from server to client to allow use of {{GENDER}} in messages client-side

TODO's:
* Add special page alias file

Change-Id: I2b2c065ecdf41d04ec4a91bbe1eba9491df3f3cd