As an admin, you have access to change the top navigation on the wiki, correct? If so, could you change Book 1: Keeper to the first one under About the Characters --> Books, because currently it is the third one down and (sorry) but my perfectionism is KILLING me? Also, in the About the Elves category, there is "Elvish Traditions" and "Elvish Communities," but the factual term is "Elvin" so could you change it to that?
Upon further investigation, SuldreenSong is correct in saying a category can't be simply renamed. You have to change the category's name for each page that has it, transfer the description to the new category, and delete the old category.