[@Denalz] Most tribes speak variants of the 'STANDARDISED UNNAMED LANGUAGE', but some to the much farther north might speak completely different languages. Dawn too speaks its own variant of the STANDARDISED UNNAMED LANGUAGE. The only other language I can make up off the top of my head is 'lingua', which is spoken in many countries to the far south and is the language used in the original versions of the The Word of Light. 

Feel free to make up a name for that language, and make up some other ones :P