I do like this idea, and you've carried it out pretty well. It did make me smile.

Possibly try Googling "British slang" for a selection of British swear words, "American slang" for a US selection, and then pick another couple of countries. For example, "merde" is the only French swear word I know, and I'm pretty sure German and Russian have some good ones. You could ask in deutschland and nederland if they have any suggestions.