[Bug 4935] Clean up the old seminars model.

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/seminars/trunk@83300 735d13b6-9817-0410-8766-e36946ffe9aa
[Bug 4935] Bugfix: Drop the colon after the payment method in the e-mail to the attendee

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/seminars/trunk@83301 735d13b6-9817-0410-8766-e36946ffe9aa