Remove legacy loadgroup and loadtask related code

Used by non-TUX UI and not really needed even in there.

Also updated some outdated comments and removed @copyright lines as
I am too lazy to update the years. @author tags are kept and git log
is much more accurate way to see who worked on what and when ;)

Change-Id: I7d24b5f15b74349a4f9b45823c41587d40181e45
i18n: add GENDER support to "supportedlanguages-translators"

- add a parameter for GENDER support

Spotted by Macofe
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Supportedlanguages-translators/es

Change-Id: I4a3ce5e34abd26401355391463b9cb887d3fc6f0
Remove unneeded CSS rule

Change-Id: Ieb6acf127e3827c43454c12bf90680a6d0a1bc57
Merge "Remove legacy loadgroup and loadtask related code"
Merge "Remove unneeded CSS rule"
Merge "i18n: add GENDER support to "supportedlanguages-translators""