Changed statusgroup loading into render_partial

git-svn-id: svn://develop.studip.de/studip/trunk@28274 c5b85792-5220-0410-ad23-ed5b6b8ad999
Complete rework

git-svn-id: svn://develop.studip.de/studip/trunk@28275 c5b85792-5220-0410-ad23-ed5b6b8ad999