Revert "Remove data_provide and data_date_format attributes"

This reverts commit 273b3f2faf.

app/assets/javascripts/application.js

@@ -17,6 +17,8 @@
 //= require chartkick
 //= require_tree ./old_design
 //= require bootstrap-sprockets
+//= require bootstrap-datepicker/core
+//= require bootstrap-datepicker/locales/bootstrap-datepicker.fr.js
 
 //= require leaflet.js
 //= require d3.min

app/assets/stylesheets/application.scss

@@ -46,6 +46,7 @@
 // = require attestation_recapitulatif
 
 // = require_self
+// = require bootstrap-datepicker3
 // = require leaflet
 // = require font-awesome
 // = require franceconnect

app/assets/stylesheets/description.scss

@@ -1,4 +1,5 @@
 @import "bootstrap";
+@import "bootstrap-datepicker3";
 
 #description-page #liste-champs {