Added file format to duplicate descriptions.
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Fix #1116849 ("Downloading metadata" window over size of screen)
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New metadata source: Edelweiss, a catalog of books that is updated directly by publishers. To enable it, go to Preferences->Metadata download and enable the Edelweiss plugin. Fixes #1091073 (Feature Request - Adding Edeleweiss as a metadata source)
When showing possible duplicates after adding books, also show the book formats.