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I switched my language to French then added a new empty book. I was offered the author name "Inconnu(e)". After adding the book that author appeared in the authors table. I draw from this test that there is no constant name for an unknown author. It depends on calibre's language when the name was used, for example when adding books.
I could add a template function that returns the value of an (English) string in the current language locale, but I am not yet convinced that it would be useful.
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