fix dialog height, fix range selection for display route, re #3989

git-svn-id: svn://develop.studip.de/studip/trunk@30908 c5b85792-5220-0410-ad23-ed5b6b8ad999
fix overlay, re #4409

git-svn-id: svn://develop.studip.de/studip/trunk@30909 c5b85792-5220-0410-ad23-ed5b6b8ad999