[TASK] RTE: Cleanup configuration of acronym table

Releases: master
Resolves: #62785
Change-Id: If85ac80d6ef210313555caf5674a1a5fe8439b38
Reviewed-on: http://review.typo3.org/33905
Reviewed-by: Stanislas Rolland <typo3@sjbr.ca>
Tested-by: Stanislas Rolland <typo3@sjbr.ca>