Hey, someone who knows about "DE:Key:admin_level" can't be an anonymous person. You must have knowledge about OSM. If you have an account, please go ahead and add them on your own. There will always be something missing in OSM. The notes function is for anonymous users who want to report an error, not knowledged people who could do that already. I actually don't have time or pleasure right now to that, but I will add them now.