Tags in ExactlyOne or Optional Tags are getting over-escaped

(Bug, Closed -> Fixed, Priority: Critical, Test Status: No automated tests yet , Reported By Justin du Coeur, )
Tag Sets
Summary: Showed up in the Cooks Guild Space, with Elinor Fettiplace's Receipt Book, which was coming up as "Fettiplace's".
Took quite a lot of investigation before realizing that it has always been sending over the wire over-escaped, and (frighteningly) saving over-escaped. But this wasn't obvious in Manifest, because that displays the value in an li tag -- so it's actually HTML, so it does need to be escaped.
After a lot of pondering, concluded that it really needs to be processed and sent unescaped, and the escaping needs to happen client-side. Made the necessary changes.