1 Corinthians 14 refers to tongues as something that can be learned - ie. a foreign language (you can't "learn" a gift if you were never given it). In the context of that chapter, we not only have rules for the use of the gift of tongues, but also for using regular foreign languages. Out of our prejudices, we are not to refuse a foreign missionary from speaking in his own (or another) language - provided there is an interpretor and the other requirements are also followed. One modern day (or at least in my lifetime) example of someone breaking these rules is the Catholic church having their services in Latin - with no interpretor. Paul indicates we need to understand what is spoken in order to be edified by it. Of course, someone else speaking in a non-human language would also be in violation of these rules.

Translated out of the original tongues...