In the import always all termentries get merged with existing ones, if the IDs are the same.

Or, if the the language and the term are the same and the checkbox "merge term entries" is active

This logic should stay, as it is.

In addition the following should be implemented:

• If the checkbox "merge term entries" is checked, an drop down field should appear with the label:
  EN: Only merge, if attribute matches
  DE: Nur zusammenführen, wenn Attribut übereinstimmt

And a tooltip showing this message:
EN: Only merge, if values of the selected attribute are not empty and match. Merging based on TbxId will still be done.
DE: Nur zusammenführen, wenn die Werte des ausgewählten Attributs nicht leer sind und übereinstimmen. Die Zusammenführung anhand der ID wird weiterhin durchgeführt.

The logic described in the tooltip should be implemented. This means, if an attribute is selected in the new drop-down the termEntries should only be merged, if 2 terms of the same language are identical (one of the in the TBX and one in the DB) AND if the selected attribute in addition has the same value in the TBX and in the DB.

Selectable in the drop-down should be all term-level attributes that exist in the DB prior to the import.