Haha, even "gratis" (free of charge) would be understood all around..
Actually, the biggest language problems between Danes, Swedes and Norwegians would be swedes having trouble understanding danish. You need to be tuned to danish intonation and diphtong, that can take a while.
I guess most CA speaks "scandinavian" or "svorsk" where you just remove/replace the words that are most odd for each language.