It's not particulary important. 2-character language codes just seem more readable to me.
Although... Seems Calibre writes 3-chars into OPF of converted e-books... Isn't _this_ behavior in contrary of EPUB standard? I mean:
Quote:
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Originally Posted by RFC 3066, 2.3 Choice of language tag:
2. When a language has both an ISO 639-1 2-character code and an ISO 639-2 3-character code, you MUST use the tag derived from the ISO 639-1 2-character code.
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