[TASK] Migrate locallang files to XLF format

Releases: 2.0.0
Change-Id: Ie8a4a2ae9544a4c8824006523d91301a7a825823
Reviewed-on: http://review.typo3.org/31617
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>