User blog comment:DaNASCAT/Technical Update: November 8, 2011/@comment-3476718-20111115085558/@comment-3235402-20111116161733

I can see how that may be technically impossible with the MediaWiki software. Look at Wikipedia (it runs on MediaWiki too, you know). Categories are stored in the page itself. So renaming a category would require some automatic change to the pages themselves, so it all bounces back to editing the pages.

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