Revert "[BUGFIX] Improve l10n_mode config for sys_file_reference"

This reverts commit b013405328a679a2c22c885215e89edf1dba5327.

Change-Id: I46c056975813bc59867782a7fa667d7ec127ecbb
Reviewed-on: http://review.typo3.org/32757
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>