[IMP]: add id and remove CalendarView.sidebar.button_add_contact templat...

...e and remove not necessary code in claendar.js, remove contacts_view.xml file, add o2m input field in base_calendar.js use some css class.
>Remove link for add contact and replace for input fields.
> remove code for web_calendar.js and add code base_calendar.js.
>add necessary css class.

Task Link
https://openerp.my.openerp.com/web#id=7779&view_type=form&model=project.task&menu_id=3942&action=327

Pad Link
https://pad.odoo.com/p/r.WAfgtXIdiEQi6fb2

Thank you,
ptr
Is this placeholder translated? Can you test with other languages and add _t(...) where required?