dialog: support attribute formaction and add options resize and reload-on-close, fixes #5156

git-svn-id: svn://develop.studip.de/studip/trunk@32739 c5b85792-5220-0410-ad23-ed5b6b8ad999
dialog: remove debug code, re #5156

git-svn-id: svn://develop.studip.de/studip/trunk@32740 c5b85792-5220-0410-ad23-ed5b6b8ad999