Make the "empty" page of Nearby more consistent with Saved Pages and History.

- Tweak prose of empty Nearby page to be more consistent.
- Make the Nearby prose a little bit more fun!
- Tweak wrapping of secondary empty message to be consistent with Saved Pages
  and history.

Change-Id: I8ca1afa741bf8b8271338a92e081a01fa8f386a1