refs #3218: cornelis wants an ok-button

git-svn-id: svn://develop.studip.de/studip/trunk@25656 c5b85792-5220-0410-ad23-ed5b6b8ad999
re #2874
use Button instead of old makeButton, better infobox text

git-svn-id: svn://develop.studip.de/studip/trunk@25658 c5b85792-5220-0410-ad23-ed5b6b8ad999