Look in the ebook's OPF file (often called package.opf or content.opf) for a dc:language in the metadata.
Does it say "en-US" or "en_US" or something else?
Also look at a few of the xhtml files and see if any xml:lang or lang attributes are set on the html tag? If so what are they so to.
Last edited by KevinH; 12-21-2020 at 06:44 PM.
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