GNU gettext utilities: Language Codes
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Appendix A Language Codes
The ISO 639 /@w standard defines two-letter codes for many languages, and three-letter codes for more rarely used languages. All abbreviations for languages used in the Translation Project should come from this standard.
| • Usual Language Codes: | Two-letter ISO 639 language codes | |
| • Rare Language Codes: | Three-letter ISO 639 language codes |
