re #3943 admin_aux restored. no time to recode now

git-svn-id: svn://develop.studip.de/studip/trunk@28610 c5b85792-5220-0410-ad23-ed5b6b8ad999
fixes empty selectbox, re #3989

git-svn-id: svn://develop.studip.de/studip/trunk@28612 c5b85792-5220-0410-ad23-ed5b6b8ad999