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und is not going to be supported in calibre. As far as calibre is concerned und and blank are equivalent. und causes problems when serialized inside ebooks (with dictionary lookup, hyphenation, etc -- various renderers see und and disable all those features, instead of falling back to the default language).
That means that supporting it in calibre would mean having to write code to make sure it does not get into ebooks when updating metadata, and it means that saving and re-importing a epub would not restore the language for the special case of und. I like to avoid special cases as much as possible.
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