add motd editor and motd display

app/templates/topics/topic.html

@@ -1,4 +1,4 @@
-{% from 'common/macros.html' import timestamp, subheader, pager %}
+{% from 'common/macros.html' import timestamp, subheader, pager, motd %}
 {% from 'common/icons.html' import icn_locked, icn_stickied %}
 {%- extends 'base.html' -%}
 {%- block title -%}browsing topic {{topic.name}}{%- endblock -%}
@@ -46,6 +46,7 @@
 {%- if threads | length == 0 -%}
 <div class="plank"><p>There are no threads in this topic yet.{%- if is_logged_in() and get_active_user().can_post_to_thread_or_topic(topic) %} Be the first to start a discussion!{%- endif -%}</p></div>
 {%- endif -%}
+{{ motd(get_motds()) }}
 {%- for thread in threads -%}
 <div class="topic-info plank">
   <div class="title-container">