It's not about what you can say - you can say whatever you like - but Sweden or whomever can't officially bestow a new meaning on a trademarked name. It's like enshrining in the dictionary that Coca-Cola means "sugary water".
Regardless, which supernational authority is going to enforce a claim like this? I think it is you who need to cite which part of international law regulates the organic development and official acceptance of new words.