[BUGFIX] Repaired Language Mode Drag & Drop as well as Drag In

Change-Id: I2223f49dd8bc8428fc77aabb6eeef422e60ae1c7
Resolves: #59424
Reviewed-on: https://review.typo3.org/31153
Reviewed-by: Lorenz Ulrich
Tested-by: Lorenz Ulrich
Reviewed-by: Jo Hasenau
Tested-by: Jo Hasenau