Those two mean two very different things though, why would the author do that? Please see RFC 5646 [0], "en" means English without any further constraints, "en-US" means English as used in the United States.
Those two mean two very different things though, why would the author do that? Please see RFC 5646 [0], "en" means English without any further constraints, "en-US" means English as used in the United States.