display correct end time, re #4822


git-svn-id: svn://develop.studip.de/studip/trunk@31813 c5b85792-5220-0410-ad23-ed5b6b8ad999
sticky sidebar: only activate if horizontal resolution >= 1024px (and add some documentation), fixes #4833

git-svn-id: svn://develop.studip.de/studip/trunk@31814 c5b85792-5220-0410-ad23-ed5b6b8ad999