change message when subscribing in forum, refs #3590

git-svn-id: svn://develop.studip.de/studip/trunk@28233 c5b85792-5220-0410-ad23-ed5b6b8ad999
Provide free room information in course events (again...), fixes #3932

git-svn-id: svn://develop.studip.de/studip/trunk@28234 c5b85792-5220-0410-ad23-ed5b6b8ad999