Backport PR-9713 for Magento 2.1 - stringify cookie value to fix #5596

(cherry picked from commit a4daf56)

Author: bka

app/code/Magento/Cookie/view/frontend/web/js/notices.js

@@ -20,7 +20,10 @@ define([
             $(this.options.cookieAllowButtonSelector).on('click', $.proxy(function() {
                 var cookieExpires = new Date(new Date().getTime() + this.options.cookieLifetime * 1000);
 
-                $.mage.cookies.set(this.options.cookieName, this.options.cookieValue, {expires: cookieExpires});
+                $.mage.cookies.set(this.options.cookieName, JSON.stringify(this.options.cookieValue), {
+                    expires: cookieExpires
+                });
+
                 if ($.mage.cookies.get(this.options.cookieName)) {
                     window.location.reload();
                 } else {