refine highlighting of active link, re #3367

git-svn-id: svn://develop.studip.de/studip/trunk@26046 c5b85792-5220-0410-ad23-ed5b6b8ad999
count forum postings only for the currently selected seminar, fixes #3390

git-svn-id: svn://develop.studip.de/studip/trunk@26047 c5b85792-5220-0410-ad23-ed5b6b8ad999