I dont know if it applies to alien languages, but sometimes we do have in fanfic stories situations like this.
When Clark takes Lois to other countries and they have to speak the language of the place, usually Clark speaks it, leaving Lois to puzzlement. I often like the idea because if i dont know the language as well, I get just as frustrated as she does.
I would suggest something obvious though:
Clark reached for his wallet and asked the Arab taxi driver, "Bikam?"
The driver checked his taximeter and replied, "hamstashar gineh."
Clark fished a fifty egyptian pound bill and handed it to the driver. "Shokran." He said, leaving the car.
It's just an idea though. I think u can pretty much understand what was the conversation about without any English being spoken.
MDL.
