That’s Cloudflare’s error page, not ours.
@Milo (GERMAN)
Any time you make a change like that it’s going to take anywhere from a couple of minutes to a couple of hours for the site cache to update. It takes a while for changes to propagate even when the admins are fixing something broken. ¯\_(ツ)_/¯
Help fund the $15 daily operational cost of Derpibooru - support us financially!