Set default locale to en_UK

 * Most users of this device is located outside of the US, so it
   makes more sense to have a locale where 24H and metric are used.

Change-Id: I616427d04c766b327cf5834b561e2cc7cd96f155
The correct locale in previous commit should be en_GB

Change-Id: I2b10e3ff3a85ad6d9093571bec2c7215cc2b3cf6