Opzimized the view, re # 3406

git-svn-id: svn://develop.studip.de/studip/trunk@26571 c5b85792-5220-0410-ad23-ed5b6b8ad999
prevent xss, re #3406

git-svn-id: svn://develop.studip.de/studip/trunk@26572 c5b85792-5220-0410-ad23-ed5b6b8ad999