Updated BrowseHappy prompt to be site-agnostic

Per the discussion in #1582, this simply replaces all explicit references to BrowseHappy with more site-agnostic wording.
This change goes hand-in-hand with the changes being discussed in #1582, but doesn't depend on them (that is, the change is useful regardless of whether the URL is changed). I am happy to change the URL here if everyone thinks it's best, but given that there is already a PR discussing it making that change here may be premature.