Overall, does the entire fate of the RP hang in the balance of whenever Colt's OC can read Unknown? It is true, it's a very hard to learn, being an ancient language. It should be nearly impossible to read for any OC nowadays, unless they have some kind of connection to an archeologist, spent time themselves learning, studying the Unkonw themselves, or something along those lines. You wouldn't really find it in a book, due to it's ancient past.
Anyways, overall, it shouldn't really matter. (And shouldn't really be a part of the school, but someone shouldn't be jumping in the kitchen, invading the cooks workspace.) So can we just drop it and move on.