further changes for the tables lifter - removing a lot of zebra styles re #4312

git-svn-id: svn://develop.studip.de/studip/trunk@29981 c5b85792-5220-0410-ad23-ed5b6b8ad999
minor change for infobox/sidebar pictures re #4312

git-svn-id: svn://develop.studip.de/studip/trunk@29982 c5b85792-5220-0410-ad23-ed5b6b8ad999