only show reply form if the user can reply

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}}{{ ' (locked)' if topic.locked() else ''}}</option>
+    <option value="{{topic.id}}" {{'selected' if selected_topic == topic.id else ''}} {{'disabled' if not get_active_user().can_post_to_thread_or_topic(topic) else ''}}>{{topic.name}}{{ ' (locked)' if topic.locked() else ''}}</option>
     {%- endfor -%}
   </select>
   <label for="title">Title</label>

app/templates/threads/thread.html

@@ -70,7 +70,7 @@
     {{- pager(page, page_count) -}}
   </fieldset>
 </div>
-{%- if is_logged_in() -%}
+{%- if is_logged_in() and get_active_user().can_post_to_thread_or_topic(thread) -%}
 <form action="{{url_for('threads.reply', thread_id=thread.id)}}" method="POST" class="plank post-edit-form">
   <h2 class="info">Reply to "{{thread.title}}"</h2>
   {{- babycode_editor_component() -}}