prevent xss fixes #4178

git-svn-id: svn://develop.studip.de/studip/trunk@29338 c5b85792-5220-0410-ad23-ed5b6b8ad999
resources: prevent xss, fixes #4179

git-svn-id: svn://develop.studip.de/studip/trunk@29339 c5b85792-5220-0410-ad23-ed5b6b8ad999
fixes #4176

description was doubled, remove one

git-svn-id: svn://develop.studip.de/studip/trunk@29340 c5b85792-5220-0410-ad23-ed5b6b8ad999
wrong checkin re #4178

git-svn-id: svn://develop.studip.de/studip/trunk@29341 c5b85792-5220-0410-ad23-ed5b6b8ad999
wrong commit 

git-svn-id: svn://develop.studip.de/studip/trunk@29342 c5b85792-5220-0410-ad23-ed5b6b8ad999