Gothic calques -- t:calque does not automatically add to cat:Gothic calques?

Yes, that is a problematic point; none of the compounds containing that word are attested in the nom. plural, the one you see is merely generated by the template. It came up in this discussion, and was not resolved. I personally am not sure how to proceed with those words, they're very irregular to say the least.

I think you should put a ? in place of the word.

Probably a good idea, but I don't think there's a parameter in the template to replace just the nominative plural, or at least I'm not good enough with templates to figure out how to do that :/