The World Map of Sanctuary.
Sanctuary Languages
As most fantasy worlds, Sanctuary consists of cultures that shares different social traits. For now, the only thing that is known about these is that there is a mutual understanding of languages between the continents, and whether this is due to the fact that people speak multiple languages through their culture, of if there is a "common" language that everyone shares is unknown. Players as well as characters and NPCs in the world travel to either site of their globe, and can still communicate with people.
Names are more socially inspired though, and country names such as "Westmarch", and town names such as Tristram, has a clear "Western" reference from our world, as does the architecture. Deckard Cain, is a character name from a person of the west, while "Abd al-Hazir" is the name of a character from the flourishing East. If everyone shares a "common" language, they still seem to retain their own cultural names.
The only known specifically mentioned language is the Umbaru people's tounge from the Teganze area of the Torajan jungles [1].