Both movies have been said by Eddie and Adam to be canon to the show's universe. That's not the point of discussion for this thread, it's a confirmed fact.
My suggestion is that similar to the "For events occuring before/after _________, see _______." statements we have on our main characters' pages, we have a statement like "For events occuring before <insert debut episode here>, see Frozen." for the Frozen characters and "For events occuring before The Bear King, see Brave." (Since The Bear King will be the earliest point we see the Brave characters in, timeline-wise.)
That way, we wouldn't have to write out copy/paste summaries of the movies in every character's description, and if by some horrible misfortune someone hasn't seen either movie, they can just click the link and read about the character's previous history.
Thoughts? It's just a sentence, so it shouldn't be that much trouble. If it's given the go ahead, I'll even do it myself to save everyone the trouble.