[Bug 4653] Crash in BE in TYPO3 CMS 6.0.x

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/seminars/trunk@80970 735d13b6-9817-0410-8766-e36946ffe9aa
[Bug 4661] Sort speakers, places, organizers, etc. by title in the backend

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/seminars/trunk@80972 735d13b6-9817-0410-8766-e36946ffe9aa