ISO-639A is a Ruby gem that provides the ISO 639-2 and ISO 639-1 data sets along
with some convenience methods for accessing different entries and entry
fields.  The data comes from the LOC ISO 639-2 UTF-8 data set.

The ISO 639-1 specification uses a two-letter code to identify a language and is
often the recommended way to identify languages in computer applications.  The
ISO 639-1 specification covers most developed and widely used languages.  The
ISO 639-2 (Wikipedia) specification uses a three-letter code, is used primarily
in bibliography and terminology and covers many more languages than the ISO
639-1 specification.

WWW: https://github.com/alphabetum/iso-639