Added missing utils class

app/static/app/js/classes/Utils.js

@@ -0,0 +1,17 @@
+let escapeEntityMap = {
+  "&": "&",
+  "<": "&lt;",
+  ">": "&gt;",
+  '"': '&quot;',
+  "'": '&#39;',
+  "/": '&#x2F;'
+};
+
+export default {
+    escapeHtml: function(string) {
+      return String(string).replace(/[&<>"'\/]/g, function (s) {
+        return escapeEntityMap[s];
+      });
+    }
+};
+