Update page title my task manager after task got shown.

app/assets/javascripts/app/controllers/taskbar_widget.coffee

@@ -49,7 +49,7 @@ class App.TaskbarWidget extends App.Controller
       item.meta = meta
       taskItems.push item
 
-      # set title
+      # update title
       if task.active
         @title meta.title
 

app/assets/javascripts/app/lib/app_post/task_manager.coffee

@@ -258,6 +258,11 @@ class _taskManagerSingleton extends App.Controller
     if controller.show
       controller.show(params_app)
 
+    # update title
+    if controller.meta
+      meta = controller.meta()
+      @title meta.title
+
     true
 
   # hide task content