Fix path of booking_chart_id

added this.dataset.context.booking_chart_id
Merge pull request #1 from nicoclavier/fix-context.booking_chart_id

Fix path of booking_chart_id
Initial structure to display weeks

first draft of week of year display:
- missing locale integration in moment.js (fr_FR can have 53 weeks
since first week is week of the 4th of january)
-week display should be made an option of the view in arch.