Revert "[BUGFIX] Improve l10n_mode config for sys_file_reference"

This reverts commit f96c1013e89994ed6ce822af6fe1b837e50d3234.

Change-Id: I0440c9f0144c707a8aa15a0024226c7115f84ce2
Reviewed-on: http://review.typo3.org/32759
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>