Issue #3239607 by szloredan, jcnventura: Klaro not working on IE11

js/klaro.drupal.js

@@ -10,7 +10,7 @@
         if (drupalSettings.klaroConfig.services !== undefined) {
           drupalSettings.klaroConfig.services.forEach(function(value, index) {
             if (drupalSettings.klaroConfig.services[index].callback !== undefined) {
-              drupalSettings.klaroConfig.services[index].callback = new Function(`return ${drupalSettings.klaroConfig.services[index].callback}`)();
+              drupalSettings.klaroConfig.services[index].callback = new Function("return " + drupalSettings.klaroConfig.services[index].callback)();
             }
           });
         }