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It is dc:language in the metadata. You can add it once for the entire document. The language setting is required for both epub2 and epub3. The next version of Sigil will have a new epub metadata editor gui to make adding it even easier. Both Epubcheck and flightcrew will let you know if you miss setting it.
If you like both, then simply use search and replace on the html tag to add it to all html files in one quick command.
Hope this helps,
KevinH
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