Returns current localize requested by the remote peer this connection is linked to.
Localize value is a way for the remote peer to advertise preferred language while generating textual diagnostics. If no localize is defined by the remote peer, that is, the value returned by this function is NULL, then you can generate the default language diagnostic.
You should not confuse this function with vortex_greetings_get_localize. That function is used to get preferred localize to be sent while connecting to a remote peer.