Updated sorting for channel's videos on view page

views/channel/view.erb

@@ -30,7 +30,7 @@
 
 <div class="row">
   <div class="twelve columns">
-    <h3>Channel videos</h3>
+    <h3>Recently updated channel videos:</h3>
     <% if channel.videos.length > 0 %>
       <table class="u-full-width">
         <thead>
@@ -38,14 +38,16 @@
             <th>Video name</th>
             <th>Video serial</th>
             <th>Video description</th>
+            <th>Last updated</th>
           </tr>
         </thead>
         <tbody>
-          <% channel.videos.each do |v| %>
+          <% channel_videos.each do |v| %>
             <tr>
               <td><a href="/video/<%= v.id %>"><%= v.name %></a></td>
               <td><%= serialize(v.serial) %></td>
               <td><%= v.description %></td>
+              <td><%= date_format(v.updated_at) %></td>
             </tr>
           <% end %>
         </tbody>