dialogs/messages: remove redundant event handler, re #4341, re #3768

git-svn-id: svn://develop.studip.de/studip/trunk@30577 c5b85792-5220-0410-ad23-ed5b6b8ad999
re #3768

adjust padding of content-area and arrows

git-svn-id: svn://develop.studip.de/studip/trunk@30578 c5b85792-5220-0410-ad23-ed5b6b8ad999