Add the Khakas language

Discussed on [[Support]]:
https://translatewiki.net/wiki/Thread:Support/%D0%98%D0%B7%D0%B5%D0%BD%D0%BD%D0%B0%D1%80%21

Change-Id: I2a26dbaf9436da4bc713ea2e65fe04ed11792de5
Merge "Add the Khakas language"