fix sidebar links, re #3989

git-svn-id: svn://develop.studip.de/studip/trunk@30972 c5b85792-5220-0410-ad23-ed5b6b8ad999
refs #4440

that stream should be sorted by age

git-svn-id: svn://develop.studip.de/studip/trunk@30973 c5b85792-5220-0410-ad23-ed5b6b8ad999
add option to settings, re #4409

git-svn-id: svn://develop.studip.de/studip/trunk@30974 c5b85792-5220-0410-ad23-ed5b6b8ad999