Original: It is the literary language for all regional subgroups of the Georgian ethnos, including those who speak other Kartvelian (South Caucasian) languages: Svans, Mingrelians, and the Laz.
Simplified: It is the literary language for all ethnographic groups of Georgian people, especially those who speak other South Caucasian languages (or Kartvelian languages): Svans, Megrelians, and the Laz.