Added instructions and tests

Change-Id: I18e491c4a0c188866dcad1f9db52c4f781054e62
diff --git a/views/ngXosViews/UITutorial/src/js/errorHandler.js b/views/ngXosViews/UITutorial/src/js/errorHandler.js
index dbe41f4..aa75d38 100644
--- a/views/ngXosViews/UITutorial/src/js/errorHandler.js
+++ b/views/ngXosViews/UITutorial/src/js/errorHandler.js
@@ -1,10 +1,9 @@
 (function () {
   'use strict';
   angular.module('xos.UITutorial')
-  .service('ErrorHandler', function(){
+  .service('ErrorHandler', function(TemplateHandler){
     this.print = (msg, done) => {
-      const errorTpl = _.template(`<span class="error">[ERROR] <%= msg %></span>`);
-      done(errorTpl({msg: msg}));
+      done(TemplateHandler.error({msg: msg}));
     };
   });
 })();
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