Disable Filename-Matching for 1:1 Files, it is possible to upload matching-faults

In the Import Wizard, when setting the Visual's layout to "join with target" two problems occur:

• When the matching is unsuccessful the Import can be uploaded anyway, this should be blocked
• When only 1 or multiple bilingual workfile and 1 or multiple visual file (joined to target) is imported, but all bilingual files belong to the same language combination, work matching filenames are expected. This is superflous and we should accept any naming in this case.
• When an error in the visual grid or the workfiles grid occurs, the grid is not focused.