The completion time of a slide now has default values for slides of type
* video (duration of the YouTube video);
* PDF (number of pages * 5 minutes);
This computation is done when uploading a slide in frontend or by an onchange
in backend. Field can still be given / modified by elearning people as
result may not be reliable (pdf parsing is not accurate, and/or you may
estimate time differently from strict page-based computation).
The course will sum up all durations of its (active) slides. Display has been
changed from "x minutes" to "x hours y minutes".
Task ID 2007294