forum: focus textarea on edit, fixes #4102

git-svn-id: svn://develop.studip.de/studip/trunk@29091 c5b85792-5220-0410-ad23-ed5b6b8ad999
fix test for default values, stop assets test from leaking its URL into other tests, re #4104


git-svn-id: svn://develop.studip.de/studip/trunk@29092 c5b85792-5220-0410-ad23-ed5b6b8ad999