Add missing variable

js/config.js

@@ -7,4 +7,5 @@
 
 
 const appRoot = 'http://localhost:8888/';
-const wsUrl = 'ws://localhost:8080';//use wss://localhost:8080/comm for secured connection
+const wsUrl = 'ws://localhost:8080';//use wss://localhost:8080/comm for secured connection
+const spinnerClass = 'fa fa-spinner faa-spin animated';