You really don't know how easy it to change infobox, the entire reason we have templates is because they allow us to quickly change things across multiple pages. They not just for style. However in this case yes, the extension to call it that saying chapter should be changed into chapter after the infobox has been edited. But that is why they invented the bots, but bots are still to complicated for me to work with, to me they make templates look easy.

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