remove more 'hands' re #4695

git-svn-id: svn://develop.studip.de/studip/trunk@31588 c5b85792-5220-0410-ad23-ed5b6b8ad999
remove old background images, new design for 3.1 re #4695

git-svn-id: svn://develop.studip.de/studip/trunk@31589 c5b85792-5220-0410-ad23-ed5b6b8ad999