Community Backlog "Mark as good": include nickname

[Deleplace]

Monitoring the info "Marked as good" for an impl is useful.

Knowing "who clicked that" would be even better. (Just the declared nickname, no real auth)

[Deleplace]

If the Nickname is already in the user's cookies, then use that.

If the user has no Nickname yet, ask them to choose a Nickname before saving the "Mark as good" action.