Here is a listing of the ISO 639 2 letter language codes...
- AA "Afar"
- AB "Abkhazian"
- AF "Afrikaans"
- AM "Amharic"
- AR "Arabic"
- AS "Assamese"
- AY "Aymara"
- AZ "Azerbaijani"
- BA "Bashkir"
- BE "Byelorussian"
- BG "Bulgarian"
- BH "Bihari"
- BI "Bislama"
- BN "Bengali" "Bangla"
- BO "Tibetan"
- BR "Breton"
- CA "Catalan"
- CO "Corsican"
- CS "Czech"
- CY "Welsh"
- DA "Danish"
- DE "German"
- DZ "Bhutani"
- EL "Greek"
- EN "English" "American"
- EO "Esperanto"
- ES "Spanish"
- ET "Estonian"
- EU "Basque"
- FA "Persian"
- FI "Finnish"
- FJ "Fiji"
- FO "Faeroese"
- FR "French"
- FY "Frisian"
- GA "Irish"
- GD "Gaelic" "Scots Gaelic"
- GL "Galician"
- GN "Guarani"
- GU "Gujarati"
- HA "Hausa"
- HI "Hindi"
- HR "Croatian"
- HU "Hungarian"
- HY "Armenian"
- IA "Interlingua"
- IE "Interlingue"
- IK "Inupiak"
- IN "Indonesian"
- IS "Icelandic"
- IT "Italian"
- IW "Hebrew"
- JA "Japanese"
- JI "Yiddish"
- JW "Javanese"
- KA "Georgian"
- KK "Kazakh"
- KL "Greenlandic"
- KM "Cambodian"
- KN "Kannada"
- KO "Korean"
- KS "Kashmiri"
- KU "Kurdish"
- KY "Kirghiz"
- LA "Latin"
- LN "Lingala"
- LO "Laothian"
- LT "Lithuanian"
- LV "Latvian" "Lettish"
- MG "Malagasy"
- MI "Maori"
- MK "Macedonian"
- ML "Malayalam"
- MN "Mongolian"
- MO "Moldavian"
- MR "Marathi"
- MS "Malay"
- MT "Maltese"
- MY "Burmese"
- NA "Nauru"
- NE "Nepali"
- NL "Dutch"
- NO "Norwegian"
- OC "Occitan"
- OM "Oromo" "Afan"
- OR "Oriya"
- PA "Punjabi"
- PL "Polish"
- PS "Pashto" "Pushto"
- PT "Portuguese"
- QU "Quechua"
- RM "Rhaeto-Romance"
- RN "Kirundi"
- RO "Romanian"
- RU "Russian"
- RW "Kinyarwanda"
- SA "Sanskrit"
- SD "Sindhi"
- SG "Sangro"
- SH "Serbo-Croatian"
- SI "Singhalese"
- SK "Slovak"
- SL "Slovenian"
- SM "Samoan"
- SN "Shona"
- SO "Somali"
- SQ "Albanian"
- SR "Serbian"
- SS "Siswati"
- ST "Sesotho"
- SU "Sudanese"
- SV "Swedish"
- SW "Swahili"
- TA "Tamil"
- TE "Tegulu"
- TG "Tajik"
- TH "Thai"
- TI "Tigrinya"
- TK "Turkmen"
- TL "Tagalog"
- TN "Setswana"
- TO "Tonga"
- TR "Turkish"
- TS "Tsonga"
- TT "Tatar"
- TW "Twi"
- UK "Ukrainian"
- UR "Urdu"
- UZ "Uzbek"
- VI "Vietnamese"
- VO "Volapuk"
- WO "Wolof"
- XH "Xhosa"
- YO "Yoruba"
- ZH "Chinese"
- ZU "Zulu"