Hmm, it looks like Send to Kindle backend now converts to KFX format books in languages that aren't officially supported (by Kindle Direct Publishing) and that Kindle Previewer wouldn't convert.
I've tested a book in croatian and a book in serbian language.
Croatia epub contains only '<dc:language>hr<\dc:language>' in.opf file, and no 'xml:lang' attributes inside HTML files.
Serbian epub has '<dc:language>sr<\dc:language>' and every paragraph has 'xml:lang="sh-RS" attribute ( that would be older "serbo-croatian" variant instead of the newer and correct value of "sr-RS").
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