re #3768

moving topics

git-svn-id: svn://develop.studip.de/studip/trunk@31018 c5b85792-5220-0410-ad23-ed5b6b8ad999
reinserted table markup regex from r28964 since r31017 fixes same problem in more general way; re #4468

git-svn-id: svn://develop.studip.de/studip/trunk@31019 c5b85792-5220-0410-ad23-ed5b6b8ad999
re #3768

hide buttons of impossible moval

git-svn-id: svn://develop.studip.de/studip/trunk@31020 c5b85792-5220-0410-ad23-ed5b6b8ad999