If you remove Farming maybe herbloring would be pretty useless aswell? I believe this is this is client sided. You could search for "Framing" in the client files and replace them with Hunting. I think that should do the trick. Would maybe be helpful to do this in source aswell Don't really know i am not going to do this.
EDIT: I do not know how it is for skills exactly but the spell book has this text in the cache, as interface. I believe it is the same for skills but i am not 100% sure.