add Copy to all languages

app/views/admin/labs/_form.html.erb

@@ -21,6 +21,9 @@
         <a data-toggle="tab" href=".<%= locale %>"><%= t(locale) %></a>
       </li>
     <% end %>
+    <li class="pull-right">
+      <%= copy_to_all_language_button(".language-nav", ".language-area") %>
+    </li>
   </ul>
 
   <!-- Language -->