Order of precedence for standards/files: Overrides, grandfathered tags: 1) language-subtag-registry.txt (from IANA: http://www.iana.org/assignments/language-subtag-registry) Language subtag: 2) ISO-639-2_utf-8.txt (ISO 639-1, from LoC: http://www.loc.gov/standards/iso639-2/ISO-639-2_utf-8.txt) 3) ISO-639-2_utf-8.txt (ISO 639-2/T, from LoC: http://www.loc.gov/standards/iso639-2/ISO-639-2_utf-8.txt) 4) iso-639-3.tab (ISO 639-3, from SIL: http://www.sil.org/iso639-3/download.asp) 5) iso-639-3_Retirements.tab (ISO 639-3 deprecated, from SIL: http://www.sil.org/iso639-3/download.asp) 6) iso639-5.pipe.txt (ISO 639-5, from LoC: http://www.loc.gov/standards/iso639-5/iso639-5.pipe.txt) Script subtag: 7) iso15924-utf8.txt (ISO 15924, from Unicode: http://unicode.org/iso15924/iso15924.txt.zip) Region subtag: 8) iso3166_en_code_lists.txt (from ISO: http://www.iso.org/iso/iso3166_en_code_lists.txt) iso3166_fr_code_lists.txt (from ISO: http://www.iso.org/iso/iso3166_fr_code_lists.txt)