Which of the ISO 639 standards does Calibre use?
The calibredb help page says the Calibre uses ISO 639 for language code and then gives the examples of en for English, fr for French.
The metadata database contains 3 character strings, eng for English for example, for the languages which implies Calibre is using ISO 639-2
Does Calibre use ISO 639-2?
or have I done something wrong again.
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