re #3768

bugfix hashtags in blubber

git-svn-id: svn://develop.studip.de/studip/trunk@31025 c5b85792-5220-0410-ad23-ed5b6b8ad999
sidebar: adjust styles to new mockup, refine search widget and adjust existing code, re #3768

git-svn-id: svn://develop.studip.de/studip/trunk@31026 c5b85792-5220-0410-ad23-ed5b6b8ad999