[BUGFIX] Fix typo in de.locallang.xlf

Releases: 6.2
Resolves: #63032
Change-Id: I381ef924ea7f77252da642290851d8231d25d97e
Reviewed-on: http://review.typo3.org/34473
Reviewed-by: Sebastian Fischer <typo3@evoweb.de>
Tested-by: Sebastian Fischer <typo3@evoweb.de>