Hey, John!
UTF-8 easily supports two byte languages, which supports just about anything you can put into your computer with the exception of some very obscur and non-standard Mandarin and a very select few other specific characters in other languages.
UTF-8 is the current web standard for internationalization. You are welcome to create a free account before you sign up for any paid account so you can make sure the character set you're using is compatible with SurveyGizmo, and hey, maybe the free account will be all you'll need :-)
If you are using a non-standard character set, we can also change your survey's header to read UTF-16 so you can use three byte characters, but this would prevent you from using some of our built-in reporting tools.