This tool finds all pages and categories in a category tree in language X. Then, it checks all of these categories in other languages, and gets pages with a language link back to X there. It lists all pages in X that are not in the original category tree, but in the tree equivalent in other languages.
Category, depth
External depth (>0 gets more pages, but is much slower) Temporarily disabled
(Example: French scientists on fr.wikipedia)
ERROR: There was an error running the query [] SELECT DISTINCT page_namespace,page_title FROM page,categorylinks WHERE cl_from=page_id AND page_namespace IN (0) AND cl_to IN ('','','','','','','','','','') AND page_is_redirect=0