Language Codes & Request.ServerVariables("HTTP_ACCEPT_LANGUAGE")

Knowing the languages selected in the browser of our visitors may be a very important data we may used to redirect the user to a specific page in the corresponding language, or to display specific information directed to the user (as for example the most suitable ad).
The basic command we will use to know the languages selected in the browser is this one:

You may get the complete code here. The list of languages may be obtained here.

The following table lists all the possible language codes used to specify various system settings.

af Afrikaans	sq Albanian
ar-sa Arabic (Saudi Arabia)	ar-iq Arabic (Iraq)
ar-eg Arabic (Egypt)	ar-ly Arabic (Libya)
ar-dz Arabic (Algeria)	ar-ma Arabic (Morocco)
ar-tn Arabic (Tunisia)	ar-om Arabic (Oman)
ar-ye Arabic (Yemen)	ar-sy Arabic (Syria)
ar-jo Arabic (Jordan)	ar-lb Arabic (Lebanon)
ar-kw Arabic (Kuwait)	ar-ae Arabic (U.A.E.)
ar-bh Arabic (Bahrain)	ar-qa Arabic (Qatar)
eu Basque	bg Bulgarian
be Belarusian	ca Catalan
zh-tw Chinese (Taiwan)	zh-cn Chinese (PRC)
zh-hk Chinese (Hong Kong, S.A.R. China)	zh-sg Chinese (Singapore)
hr Croatian	cs Czech
da Danish	nl Dutch (Standard)
nl-be Dutch (Belgium)	en English
en-us English (United States)	en-gb English (Great Britain)
en-au English (Australia)	en-ca English (Canada)
en-nz English (New Zealand)	en-ie English (Ireland)
en-za English (South Africa)	en-jm English (Jamaica)
en English (Caribbean)	en-bz English (Belize)
en-tt English (Trinidad)	et Estonian
fo Faeroese	fa Farsi
fi Finnish	fr French (Standard)
fr-be French (Belgium)	fr-ca French (Canada)
fr-ch French (Switzerland)	fr-lu French (Luxembourg)
gd Gaelic (Scotland)	gd-ie Gaelic (Ireland)
de German (Standard)	de-ch German (Switzerland)
de-at German (Austria)	de-lu German (Luxembourg)
de-li German (Liechtenstein)	el Greek
he Hebrew	hi Hindi
hu Hungarian	is Icelandic
in Indonesian	it Italian (Standard)
it-ch Italian (Switzerland)	ja Japanese
ko Korean	ko Korean (Johab)
lv Latvian	lt Lithuanian
mk FYRO Macedonian	ms Malaysian
mt Maltese	no Norwegian (Bokmal)
no Norwegian (Nynorsk)	pl Polish
pt-br Portuguese (Brazil)	pt Portuguese (Standard)
rm Rhaeto-Romanic	ro Romanian
ro-mo Romanian (Moldavia)	ru Russian
ru-mo Russian (Moldavia)	sz Sami (Lappish)
sr Serbian (Cyrillic)	sr Serbian (Latin)
sk Slovak	sl Slovenian
sb Sorbian	es Spanish (Spain – Traditional)
es-mx Spanish (Mexico)	es Spanish (Spain – Modern)
es-gt Spanish (Guatemala)	es-cr Spanish (Costa Rica)
es-pa Spanish (Panama)	es-do Spanish (Dominican Republic)
es-ve Spanish (Venezuela)	es-co Spanish (Colombia)
es-pe Spanish (Peru)	es-ar Spanish (Argentina)
es-ec Spanish (Ecuador)	es-cl Spanish (Chile)
es-uy Spanish (Uruguay)	es-py Spanish (Paraguay)
es-bo Spanish (Bolivia)	es-sv Spanish (El Salvador)
es-hn Spanish (Honduras)	es-ni Spanish (Nicaragua)
es-pr Spanish (Puerto Rico)	sx Sutu
sv Swedish	sv-fi Swedish (Finland)
th Thai	ts Tsonga
tn Tswana	tr Turkish
uk Ukrainian	ur Urdu
ve Venda	vi Vietnamese
xh Xhosa	ji Yiddish
zu Zulu