Am 01.06.2015 um 22:26 schrieb Markus Krötzsch:
Finally, the technical question is: Why is this even possible? I thought that, in each language, label+description are a key (globally unique), yet here we have many pairs of items with exactly the same label and description. Or is the problem that no description was entered and so the system does not apply the key?
The uniqueness constraint does indeed not apply if there is no description.