Use case when it happens:
* Create a maintenance request
* Schedule a date with a duration greater than 1 hour
* Switch to calendar view
* The maintenance request stop time is equal to start time plus 1 hour
and the duration is equal to 1hour.
The calendar view doesn't correctly display the duration and stop date because
the duration field was not passed to the xml view.
This commit pass the duration to the calendar view in the xml and corrects
the help text of the duration field.
Haresh Shyara
183aa1591d