configure toolbar to be collapsible; fixes #4577

git-svn-id: svn://develop.studip.de/studip/trunk@31517 c5b85792-5220-0410-ad23-ed5b6b8ad999
deactivate CKEditor's magic-line plugin; fixes #4567

git-svn-id: svn://develop.studip.de/studip/trunk@31518 c5b85792-5220-0410-ad23-ed5b6b8ad999