[BUGFIX] Check correctly for allowed localization action

The localization wizard currently disallows creating copies if a column
has elements. There are now two flags which influence the allowed
actions. The wizard now checks whether there are translations or
standalone content elements and negates one of the flags.

Change-Id: Ief40d311959943f2f7e901b80e4b29931f2894d2
Resolves: #73538
Releases: master, 7.6
Reviewed-on: https://review.typo3.org/46753


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Ralf Merz <info@merzilla.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>