From OTRS:
https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom;TicketID=11199109
Hello developers,
Why Shan Language doesn't include in Languages list? shn.wikipedia has been launched almost a year. A tranlation for iOS app also completed. We, Shan Wikipedia users will be happy if you can cheack it and we are waiting to see our Shan Language in the coming Wikipedia iOS app.
With many thanks.