fixed Bug #57727

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/cal/trunk@84682 735d13b6-9817-0410-8766-e36946ffe9aa
added changelog comment for 1.5.6

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/cal/trunk@84685 735d13b6-9817-0410-8766-e36946ffe9aa