re #3768

adjust dialog style like a mockup of Martin

git-svn-id: svn://develop.studip.de/studip/trunk@30801 c5b85792-5220-0410-ad23-ed5b6b8ad999
re #3768

permission checks and encoding fixed

git-svn-id: svn://develop.studip.de/studip/trunk@30802 c5b85792-5220-0410-ad23-ed5b6b8ad999