Douban's English-language book records are sparse and low quality. BookPageProvider now picks a CJK title from the title or aliases for Douban (and still allows a precise ISBN), and skips Douban entirely when only a Latin title is available; Goodreads continues to cover Latin titles. Aliases now reach the page search so a translated book's Chinese title is used. New unit test covers the four cases; ISBN cross-title matching is preserved.
Kai
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