re #4609

remove shadow from header-icon's badge

git-svn-id: svn://develop.studip.de/studip/trunk@31414 c5b85792-5220-0410-ad23-ed5b6b8ad999
optimize icons from [31412] for size (saves 47%), re #4609

git-svn-id: svn://develop.studip.de/studip/trunk@31415 c5b85792-5220-0410-ad23-ed5b6b8ad999