Moved global AJAX Error handler definition to main.coffee

cms/static/coffee/src/main.coffee

@@ -15,6 +15,13 @@ $ ->
     headers : { 'X-CSRFToken': $.cookie 'csrftoken' }
     dataType: 'json'
 
+  $(document).ajaxError (event, jqXHR, ajaxSettings, thrownError) ->
+    msg = new CMS.Models.ErrorMessage(
+        "title": gettext("Studio's having trouble saving your work")
+        "message": jqXHR.responseText || gettext("This may be happening because of an error with our server or your internet connection. Try refreshing the page or making sure you are online.")
+    )
+    new CMS.Views.Notification({model: msg})
+
   window.onTouchBasedDevice = ->
     navigator.userAgent.match /iPhone|iPod|iPad/i