Fix multi line form label

!163 (merged) had one visual issue: one of the inactive form labels was long, split to two lines, and looked bad. This MR fixes that. It also updates the form label story to handle some alternate scenarios, and for good measure I threw the label into the login component (trying to incrementally phase this in when it's convenient).

These are broken up nicely into three different commits, if you'd like to view each one separately. Once this is merged into the branch for #186 (closed) I can wrap that up.