new generic icon for all office-type documents re #2883

git-svn-id: svn://develop.studip.de/studip/trunk@25305 c5b85792-5220-0410-ad23-ed5b6b8ad999
current version of file icons re #2883

git-svn-id: svn://develop.studip.de/studip/trunk@25306 c5b85792-5220-0410-ad23-ed5b6b8ad999
current version of the file-office icon is used re #2883

git-svn-id: svn://develop.studip.de/studip/trunk@25307 c5b85792-5220-0410-ad23-ed5b6b8ad999