Określenie języka może odbywać się na dwa sposoby: pierwszy definiuje język na podstawie dwuliterowych skrótów z normy ISO 639, np. lang='en' (język angielski), a druga uzupełnia język o dodatkowy dialekt kraju, których dwuliterowe skróty definiuje norma ISO 3166, np.:
lang='en-US' (angielski używany w Stanach Zjednoczonych),
lang='fr-CA' (francuski stosowany w Kanadzie).
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| 1. | AD | Andorra | | 2. | AE | United Arab Emirates | | 3. | AF | Afghanistan | | 4. | AG | Antigua and Barbuda | | 5. | AI | Anguilla | | 6. | AL | Albania | | 7. | AM | Armenia | | 8. | AN | Netherlands Antilles | | 9. | AO | Angola | | 10. | AQ | Antarctica | | 11. | AR | Argentina | | 12. | AS | American Samoa | | 13. | AT | Austria | | 14. | AU | Australia | | 15. | AW | Aruba | | 16. | AZ | Azerbaijan | | 17. | BA | Bosnia and Herzegovina | | 18. | BB | Barbados | | 19. | BD | Bangladesh | | 20. | BE | Belgium | | 21. | BF | Burkina Faso | | 22. | BG | Bulgaria | | 23. | BH | Bahrain | | 24. | BI | Burundi | | 25. | BJ | Benin | | 26. | BM | Bermuda | | 27. | BN | Brunei Darussalam | | 28. | BO | Bolivia | | 29. | BR | Brazil | | 30. | BS | Bahamas | | 31. | BT | Bhutan | | 32. | BV | Bouvet Island | | 33. | BW | Botswana | | 34. | BY | Belarus | | 35. | BZ | Belize | | 36. | CA | Canada | | 37. | CC | Cocos (Keeling) Islands | | 38. | CF | Central African Republic | | 39. | CG | Congo | | 40. | CH | Switzerland | | 41. | CI | Cote D'Ivoire (Ivory Coast) | | 42. | CK | Cook Islands | | 43. | CL | Chile | | 44. | CM | Cameroon | | 45. | CN | China | | 46. | CO | Colombia | | 47. | CR | Costa Rica | | 48. | CS | Czechoslovakia | | 49. | CU | Cuba | | 50. | CV | Cape Verde | | 51. | CX | Christmas Island | | 52. | CY | Cyprus | | 53. | CZ | Czech Republic | | 54. | DE | Germany | | 55. | DJ | Djibouti | | 56. | DK | Denmark | | 57. | DM | Dominica | | 58. | DO | Dominican Republic | | 59. | DZ | Algeria | | 60. | EC | Ecuador | | 61. | EE | Estonia | | 62. | EG | Egypt | | 63. | EH | Western Sahara | | 64. | ER | Eritrea | | 65. | ES | Spain | | 66. | ET | Ethiopia | | 67. | FI | Finland | | 68. | FJ | Fiji | | 69. | FK | Falkland Islands (Malvinas) | | 70. | FM | Micronesia | | 71. | FO | Faroe Islands | | 72. | FR | France | | 73. | FX | France, Metropolitan | | 74. | GA | Gabon | | 75. | GB | Great Britain (UK) | | 76. | GD | Grenada | | 77. | GE | Georgia | | 78. | GF | French Guiana | | 79. | GH | Ghana | | 80. | GI | Gibraltar | | 81. | GL | Greenland | | 82. | GM | Gambia | | 83. | GN | Guinea | | 84. | GP | Guadeloupe | | 85. | GQ | Equatorial Guinea | | 86. | GR | Greece | | 87. | GS | S. Georgia and S. Sandwich Isls. | | 88. | GT | Guatemala | | 89. | GU | Guam | | 90. | GW | Guinea-Bissau | | 91. | GY | Guyana | | 92. | HK | Hong Kong | | 93. | HM | Heard and McDonald Islands | | 94. | HN | Honduras | | 95. | HR | Croatia (Hrvatska) | | 96. | HT | Haiti | | 97. | HU | Hungary | | 98. | ID | Indonesia | | 99. | IE | Ireland | | 100. | IL | Israel | | 101. | IN | India | | 102. | IO | British Indian Ocean Territory | | 103. | IQ | Iraq | | 104. | IR | Iran | | 105. | IS | Iceland | | 106. | IT | Italy | | 107. | JM | Jamaica | | 108. | JO | Jordan | | 109. | JP | Japan | | 110. | KE | Kenya | | 111. | KG | Kyrgyzstan | | 112. | KH | Cambodia | | 113. | KI | Kiribati | | 114. | KM | Comoros | | 115. | KN | Saint Kitts and Nevis | | 116. | KP | Korea (North) | | 117. | KR | Korea (South) | | 118. | KW | Kuwait | | 119. | KY | Cayman Islands | | 120. | KZ | Kazakhstan | | 121. | LA | Laos | | 122. | LB | Lebanon | | 123. | LC | Saint Lucia | | 124. | LI | Liechtenstein | | 125. | LK | Sri Lanka | | 126. | LR | Liberia | | 127. | LS | Lesotho | | 128. | LT | Lithuania | | 129. | LU | Luxembourg | | 130. | LV | Latvia | | 131. | LY | Libya | | 132. | MA | Morocco | | 133. | MC | Monaco | | 134. | MD | Moldova | | 135. | MG | Madagascar | | 136. | MH | Marshall Islands | | 137. | MK | Macedonia | | 138. | ML | Mali | | 139. | MM | Myanmar | | 140. | MN | Mongolia | | 141. | MO | Macau | | 142. | MP | Northern Mariana Islands | | 143. | MQ | Martinique | | 144. | MR | Mauritania | | 145. | MS | Montserrat | | 146. | MT | Malta | | 147. | MU | Mauritius | | 148. | MV | Maldives | | 149. | MW | Malawi | | 150. | MX | Mexico | | 151. | MY | Malaysia | | 152. | MZ | Mozambique | | 153. | NA | Namibia | | 154. | NC | New Caledonia | | 155. | NE | Niger | | 156. | NF | Norfolk Island | | 157. | NG | Nigeria | | 158. | NI | Nicaragua | | 159. | NL | Netherlands | | 160. | NO | Norway | | 161. | NP | Nepal | | 162. | NR | Nauru | | 163. | NT | Neutral Zone | | 164. | NU | Niue | | 165. | NZ | New Zealand (Aotearoa) | | 166. | OM | Oman | | 167. | PA | Panama | | 168. | PE | Peru | | 169. | PF | French Polynesia | | 170. | PG | Papua New Guinea | | 171. | PH | Philippines | | 172. | PK | Pakistan | | 173. | PL | Poland | | 174. | PM | St. Pierre and Miquelon | | 175. | PN | Pitcairn | | 176. | PR | Puerto Rico | | 177. | PT | Portugal | | 178. | PW | Palau | | 179. | PY | Paraguay | | 180. | QA | Qatar | | 181. | RE | Reunion | | 182. | RO | Romania | | 183. | RU | Russian Federation | | 184. | RW | Rwanda | | 185. | SA | Saudi Arabia | | 186. | SB | Solomon Islands | | 187. | SC | Seychelles | | 188. | SD | Sudan | | 189. | SE | Sweden | | 190. | SG | Singapore | | 191. | SH | St. Helena | | 192. | SI | Slovenia | | 193. | SJ | Svalbard and Jan Mayen Islands | | 194. | SK | Slovak Republic | | 195. | SL | Sierra Leone | | 196. | SM | San Marino | | 197. | SN | Senegal | | 198. | SO | Somalia | | 199. | SR | Suriname | | 200. | ST | Sao Tome and Principe | | 201. | SU | USSR | | 202. | SV | El Salvador | | 203. | SY | Syria | | 204. | SZ | Swaziland | | 205. | TC | Turks and Caicos Islands | | 206. | TD | Chad | | 207. | TF | French Southern Territories | | 208. | TG | Togo | | 209. | TH | Thailand | | 210. | TJ | Tajikistan | | 211. | TK | Tokelau | | 212. | TM | Turkmenistan | | 213. | TN | Tunisia | | 214. | TO | Tonga | | 215. | TP | East Timor | | 216. | TR | Turkey | | 217. | TT | Trinidad and Tobago | | 218. | TV | Tuvalu | | 219. | TW | Taiwan | | 220. | TZ | Tanzania | | 221. | UA | Ukraine | | 222. | UG | Uganda | | 223. | UK | United Kingdom | | 224. | UM | US Minor Outlying Islands | | 225. | US | United States | | 226. | UY | Uruguay | | 227. | UZ | Uzbekistan | | 228. | VA | Vatican City State (Holy See) | | 229. | VC | Saint Vincent and the Grenadines | | 230. | VE | Venezuela | | 231. | VG | Virgin Islands (British) | | 232. | VI | Virgin Islands (U.S.) | | 233. | VN | Viet Nam | | 234. | VU | Vanuatu | | 235. | WF | Wallis and Futuna Islands | | 236. | WS | Samoa | | 237. | YE | Yemen | | 238. | YT | Mayotte | | 239. | YU | Yugoslavia | | 240. | ZA | South Africa | | 241. | ZM | Zambia | | 242. | ZR | Zaire | | 243. | ZW | Zimbabwe |
| | 1. | aa | Afar | | 2. | ab | Abkhazian | | 3. | af | Afrikaans | | 4. | am | Amharic | | 5. | ar | Arabic | | 6. | as | Assamese | | 7. | ay | Aymara | | 8. | az | Azerbaijani | | 9. | ba | Bashkir | | 10. | be | Byelorussian | | 11. | bg | Bulgarian | | 12. | bh | Bihari | | 13. | bi | Bislama | | 14. | bn | Bengali; Bangla | | 15. | bo | Tibetan | | 16. | br | Breton | | 17. | ca | Catalan | | 18. | co | Corsican | | 19. | cs | Czech | | 20. | cy | Welsh | | 21. | da | Danish | | 22. | de | German | | 23. | dz | Bhutani | | 24. | el | Greek | | 25. | en | English | | 26. | eo | Esperanto | | 27. | es | Spanish | | 28. | et | Estonian | | 29. | eu | Basque | | 30. | fa | Persian | | 31. | fi | Finnish | | 32. | fj | Fiji | | 33. | fo | Faroese | | 34. | fr | French | | 35. | fy | Frisian | | 36. | ga | Irish | | 37. | gd | Scots Gaelic | | 38. | gl | Galician | | 39. | gn | Guarani | | 40. | gu | Gujarati | | 41. | ha | Hausa | | 42. | he | Hebrew (poprzednio iw) | | 43. | hi | Hindi | | 44. | hr | Croatian | | 45. | hu | Hungarian | | 46. | hy | Armenian | | 47. | ia | Interlingua | | 48. | id | Indonesian (poprzednio in) | | 49. | ie | Interlingue | | 50. | ik | Inupiak | | 51. | is | Icelandic | | 52. | it | Italian | | 53. | iu | Inuktitut | | 54. | ja | Japanese | | 55. | jw | Javanese | | 56. | ka | Georgian | | 57. | kk | Kazakh | | 58. | kl | Greenlandic | | 59. | km | Cambodian | | 60. | kn | Kannada | | 61. | ko | Korean | | 62. | ks | Kashmiri | | 63. | ku | Kurdish | | 64. | ky | Kirghiz | | 65. | la | Latin | | 66. | ln | Lingala | | 67. | lo | Laothian | | 68. | lt | Lithuanian | | 69. | lv | Latvian, Lettish | | 70. | mg | Malagasy | | 71. | mi | Maori | | 72. | mk | Macedonian | | 73. | ml | Malayalam | | 74. | mn | Mongolian | | 75. | mo | Moldavian | | 76. | mr | Marathi | | 77. | ms | Malay | | 78. | mt | Maltese | | 79. | my | Burmese | | 80. | na | Nauru | | 81. | ne | Nepali | | 82. | nl | Dutch | | 83. | no | Norwegian | | 84. | oc | Occitan | | 85. | om | (Afan) Oromo | | 86. | or | Oriya | | 87. | pa | Punjabi | | 88. | pl | Polish | | 89. | ps | Pashto, Pushto | | 90. | pt | Portuguese | | 91. | qu | Quechua | | 92. | rm | Rhaeto-Romance | | 93. | rn | Kirundi | | 94. | ro | Romanian | | 95. | ru | Russian | | 96. | rw | Kinyarwanda | | 97. | sa | Sanskrit | | 98. | sd | Sindhi | | 99. | sg | Sangho | | 100. | sh | Serbo-Croatian | | 101. | si | Sinhalese | | 102. | sk | Slovak | | 103. | sl | Slovenian | | 104. | sm | Samoan | | 105. | sn | Shona | | 106. | so | Somali | | 107. | sq | Albanian | | 108. | sr | Serbian | | 109. | ss | Siswati | | 110. | st | Sesotho | | 111. | su | Sundanese | | 112. | sv | Swedish | | 113. | sw | Swahili | | 114. | ta | Tamil | | 115. | te | Telugu | | 116. | tg | Tajik | | 117. | th | Thai | | 118. | ti | Tigrinya | | 119. | tk | Turkmen | | 120. | tl | Tagalog | | 121. | tn | Setswana | | 122. | to | Tonga | | 123. | tr | Turkish | | 124. | ts | Tsonga | | 125. | tt | Tatar | | 126. | tw | Twi | | 127. | ug | Uighur | | 128. | uk | Ukrainian | | 129. | ur | Urdu | | 130. | uz | Uzbek | | 131. | vi | Vietnamese | | 132. | vo | Volapuk | | 133. | wo | Wolof | | 134. | xh | Xhosa | | 135. | yi | Yiddish (poprzednio ji) | | 136. | yo | Yoruba | | 137. | za | Zhuang | | 138. | zh | Chinese | | 139. | zu | Zulu |
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