Renaming Themes to Skins

Signed-off-by: Sven Rissmann <creaworld-media@gmx.de>
* Updated translations to latest. (Admin, ManageMembers)

! Missing translation. (Admin.french.php)

Signed-off-by: Nao <nao@wedge>
Merge branch 'master' of https://github.com/Wedge/languages into dev