Fixes issue with the buttons in the message handler.

index.html

     <script src="libs/popover.js?v=1"></script><!-- bootstrap tooltip lib -->
     <script src="libs/toastr.js?v=1"></script><!-- notifications lib -->
     <script src="interface_config.js?v=5"></script>
-    <script src="libs/app.bundle.js?v=17"></script>
+    <script src="libs/app.bundle.js?v=18"></script>
     <script src="analytics.js?v=1"></script><!-- google analytics plugin -->
     <link rel="stylesheet" href="css/font.css?v=6"/>
     <link rel="stylesheet" href="css/toastr.css?v=1">

modules/UI/prezi/Prezi.js

                 "dialog.Back", "Back");
             var buttons = {};
             var buttons1 = {};
-            buttons1.Cancel = buttons.Cancel = {title: cancelButton, value: false};
-            buttons.share = {title: shareButton, value: true};
-            buttons1.Back = {title: backButton, value: true};
+            buttons1.button1 = buttons.button1 = {title: cancelButton, value: false};
+            buttons.button2 = {title: shareButton, value: true};
+            buttons1.button2 = {title: backButton, value: true};
             var linkError = APP.translation.generateTranslatonHTML(
                 "dialog.preziLinkError", "Please provide a correct prezi link.")
             var openPreziState = {

modules/UI/util/MessageHandler.js

     {
         var leftButton = APP.translation.generateTranslatonHTML(leftButtonKey);
         var buttons = {};
-        buttons.leftButton = {title: leftButton, value: true};
+        buttons.button1 = {title: leftButton, value: true};
         var cancelButton = APP.translation.generateTranslatonHTML("dialog.Cancel",
             "Cancel");
-        buttons.Cancel = {title: cancelButton, value: false};
+        buttons.button2 = {title: cancelButton, value: false};
         var message = msgString, title = titleString;
         if(titleKey)
         {