locale
Description:
The locale to use for network requests, in UNIX locale format.
(e.g. "en_GB", "cs", "de_DE".) Use null
for the default "C" locale (typically "en_US").
This locale will be used by the server-side software to localise the authentication and authorization pages at the URI returned by build_authentication_uri.
The server-side behaviour is undefined if it doesn't support a given locale.