Improve/add information on screen

[izivkov]

Improve display information the watch to the LCD display of the Raspberry Pi. Some ideas:

1. Add watch's timezone, like America/Toronto.
2. Localize time and temperature according location, i.e AM/PM for time, Celsius or Fahrenheit for temperature
3. Fix Next Alarm value. Current;y shows the first alarm, should show next upcoming alarm based on current time.
4. Improve initial screen to instruct user how to connect, i.e pressing button the watch
5. Improve graphics