* The Gregorian date now appears in the corner of every square of the month grid,
  not only under the big date — which is where the translation is most wanted.
* AM and PM have a place of their own in the layout: beside the minute where the
  time reads across one line, and a line under it where hour and minute are stacked.
* The noon and midnight settings only appear when the 12-hour clock is on.
* The lunar calendars say so in their names: Chinese lunar, Korean lunar,
  Vietnamese lunar.
