check correct visibility attribute, fixes #4075


git-svn-id: svn://develop.studip.de/studip/trunk@28959 c5b85792-5220-0410-ad23-ed5b6b8ad999
fix comments, refs #3484

git-svn-id: svn://develop.studip.de/studip/trunk@28960 c5b85792-5220-0410-ad23-ed5b6b8ad999
use correct file attribute, fixes #4073


git-svn-id: svn://develop.studip.de/studip/trunk@28961 c5b85792-5220-0410-ad23-ed5b6b8ad999