[FIX] make first day of week in date pickers coherent with locale and calendar view

bzr revid: xmo@openerp.com-20120831145355-7itr8svth1vtv3m3

addons/web/static/src/js/view_form.js

@@ -2193,7 +2193,8 @@ instance.web.DateTimeWidget = instance.web.Widget.extend({
             changeMonth: true,
             changeYear: true,
             showWeek: true,
-            showButtonPanel: true
+            showButtonPanel: true,
+            firstDay: Date.CultureInfo.firstDayOfWeek
         });
         this.$el.find('img.oe_datepicker_trigger').click(function() {
             if (self.get("effective_readonly") || self.picker('widget').is(':visible')) {