Board Thread:General Discussion/@comment-24.184.69.45-20140901164200/@comment-4568327-20140901175020

You rename the images like you would any other page (only an admin can do this), and then you have to go through Special:WhatLinksHere and fix all of the links. Alternatively, you can use a redirect, so you don't have to fix all of the links to the image, and old links will still work.