The Locale::Country module provides access to the ISO two-letter codes
for identifying countries, as defined in ISO 3166.  You can either access
the codes via the section on conversion routines (described below), or
with the two functions which return lists of all country codes or all
country names.

The Locale::Language module provides access to the ISO two-letter codes
for identifying languages, as defined in ISO 639.  You can either access
the codes via the the section on conversion routines (described below),
or with the two functions which return lists of all language codes
or all language names.

WWW: https://metacpan.org/release/Locale-Codes