StEP00249: add new icons for my institutes, re #4484

git-svn-id: svn://develop.studip.de/studip/trunk@31179 c5b85792-5220-0410-ad23-ed5b6b8ad999
documents: generalize download, store download counts correctly, re #4235

git-svn-id: svn://develop.studip.de/studip/trunk@31180 c5b85792-5220-0410-ad23-ed5b6b8ad999