repair self registration re #5170

git-svn-id: svn://develop.studip.de/studip/trunk@32792 c5b85792-5220-0410-ad23-ed5b6b8ad999
dialog: add css class to hide content specifically in dialog, #5156

git-svn-id: svn://develop.studip.de/studip/trunk@32793 c5b85792-5220-0410-ad23-ed5b6b8ad999