So! We're not actually sure why this happened and it might be an issue with our CMS. It's been re-published, but the changes haven't shown up yet.
Edit: Good news! It is now no longer Literally Unreadable (if you don't know German): https://www.guildwars2.com/en/news/light-up-the-sky-with-the-forged-backpack-and-glider-combo/