Instructions to delete a language to Digma devices

Digma Citi 1590 3G Digma Citi 1590 3G
Digma Citi 8589 3G Digma Citi 8589 3G
Digma Plane 8595 3G Digma Plane 8595 3G
Digma Plane 1573N 4G Digma Plane 1573N 4G