This library retrieves locale information configured on the system. This is helpful if you want to write applications and libraries that display messages in the user's native language.
Primarily you'll want to use the functions
language to retrieve the information. You can also
setf them if you want to force a particular setting.
(system-locale:locale) ; => "en_GB.UTF-8" (system-locale:language) ; => "en"
discover-active-languages describe how the locale and language discovery is handled.