tooltips: use a different approach to set the icon so the usage in the forum will no longe break, re #4587

git-svn-id: svn://develop.studip.de/studip/trunk@31367 c5b85792-5220-0410-ad23-ed5b6b8ad999
tooltips: some more refinements for the forum, re #4587

git-svn-id: svn://develop.studip.de/studip/trunk@31368 c5b85792-5220-0410-ad23-ed5b6b8ad999
tooltips: some more refinements for the forum, re #4587

git-svn-id: svn://develop.studip.de/studip/trunk@31369 c5b85792-5220-0410-ad23-ed5b6b8ad999