Board Thread:General Discussion/@comment-23932365-20140815202503/@comment-4143277-20140815203541

Tupka217 wrote: Because the category is attached to every page in it. It's not just a page. You'd have to change the category on every page inthe cat, either manually or with a bot, and then delete the old category.

Actually, there's another solution: a script which acts in the same way as renaming a category. It will updates all categories to the new "renamed" one, and is much quicker than using a bot. That being said, it should be done on a bot account or under the effects of a bot flag to avoid flooding recent changes/wiki activity.