add new thread route

app/templates/threads/new_thread.html

@@ -7,7 +7,7 @@
   <label for="topic">Topic</label>
   <select name="topic_id" id="topic" autocomplete="off">
     {%- for topic in topics -%}
-    <option value="{{topic.id}}" {{'selected' if selected_topic == topic.id else ''}} {{'disabled' if not get_active_user().can_post_to_topic(topic) else ''}}>{{topic.name}}</option>
+    <option value="{{topic.id}}" {{'selected' if selected_topic == topic.id else ''}} {{'disabled' if not get_active_user().can_post_to_topic(topic) else ''}}>{{topic.name}}{{ ' (locked)' if topic.locked() else ''}}</option>
     {%- endfor -%}
   </select>
   <label for="title">Title</label>