1.If Origin has no Official Language (Regional) apart from Hindi then Destinations Regional language is used.
2. If a Place has 2nd official language then you can add it (Make sure to contact TLs before Confirmation depending on updating names) for example sanskrit in ur case.
3. Never Update Regional of Enroute States For Example Train Starts at HP and Ends At GJ then Punjab, Haryanaa, RJ is NOT allowed.