CS1 maint: Unrecognized language

Text that is not a recognized language code or name (the 'and' in |language=German and French) will add the article to this category because the citation module is looking for a single language name or code, or a comma-separated list of language names and/or codes; |language=German and French should be changed to: |language=German, French.

Pages in this category should only be added by Module:Citation/CS1.

While most of the Citation Style 1 and Citation Style 2 error messages are visible to all readers, some remain hidden. Editors who wish to see all of the CS1|2 error messages can do so by updating their or CSS stylesheet to include:

Even with this css installed, older pages in 's cache may not have been updated to show these error messages even though the page is listed in one of the tracking categories. A WP:NULLEDIT will resolve that issue.

The above code is required if you wish to see maintenance category messages:

The following 200 pages are in this category, out of 2,299 total. This list may not reflect recent changes (learn more).

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Wikipedia