apple_current_locale_identifier(-Identifier)Unify Identifier with the value for CFLocaleGetIdentifier()
of the Apple current locale. The Identifier is an atom that
consists of the primary language identifier, e.g., en for
english followed by an undercore and an identifier for the Region
in the MacOS
Language & Region preferences. For example, with the
primary language set to “English (UK)'' and the Region to “United
Kingdom'' we get en_GB. This relates to the locale
identifier
en_GB.UTF-8. Unfortunately it is not that simple. For
example, we can combine the primary language “English (UK)'' with
the
Region “Netherlands'' to end up with en_NL
which is not a valid MacOS locale.