Show date and time on Schedules and Details in UTC (TNL-85).

Make the dates/times on the Schedules and Details page reflect UTC, not the local time. 

Issue: https://openedx.atlassian.net/browse/TNL-85

Sandbox: http://studio.olmar.m.sandbox.edx.org/
Reviewers: @polesye @cahrens 
```javascript
...
currentTimeText = gettext(
  '%(hours)s:%(minutes)s%(am_pm_designator)s (current UTC time)');
);

$(e.currentTarget).attr('title', interpolate(currentTimeText, {
  'hours': hours % 12 === 0 ? 12 : hours % 12,
  'minutes': (minutes < 10 ? '0' : '') + minutes,
  'am_pm_designator': hours < 12 ? 'am' : 'pm'
}, true))
```

Fixed.