There's a strange "Join" text at the top left. But a user is not joining anything, they are registering (I know, they are actually joining a team, but that's not how it's described). The text is confusing.
This is fine for now. They really are joining a team, and we should explain that better in terms of Challenge Registration, rather than changing how joining teams works.
Agreed! I'll file a CHALLENGE issue.
Reopening for discussion with challenge WG to get feedback.
A simple fix (take less time than writing this comment) would be to remove the modal title here.
If it's a challenge signup, then do not show "Join" in the dialog title (show a blank dialog title). If not a challenge signup, then still show "Join".