[asterisk-users] Where are 2 letter language values defined?

[Steve Edwards]

I've googled for way too long, where are the 2 letter language values 
defined?

I know:

en = English
es = Spanish
fr = French

but what about Croatian, Russian, Serbian, Vulcan, etc?

Is there a list documented for Asterisk or is it "just use the 2 letter 
country code Internet TLD?"

Thanks in advance,
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Steve Edwards      sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                             Fax: +1-760-731-3000