perm check fix, re #3768

git-svn-id: svn://develop.studip.de/studip/trunk@31241 c5b85792-5220-0410-ad23-ed5b6b8ad999
literature dialogs and changed navigation, re #3768

git-svn-id: svn://develop.studip.de/studip/trunk@31242 c5b85792-5220-0410-ad23-ed5b6b8ad999