修复discussion模块

templates/discussion_create.html

@@ -1,10 +1,11 @@
+{% set page_name = "discussion_create" %}
 {% extends "layout/basic.html" %}
 {% block content %}
 <div class="row">
   <div class="medium-9 columns">
     <div class="section">
       <div class="section__header">
-        <h1 class="section__title">{{ _('Create Discussion in {0}').format(title) }}</h1>
+        <h1 class="section__title">{{ _('Create Discussion in {0}').format(vnode.title) }}</h1>
       </div>
       <div class="section__body">
         <form method="post">