Make context menu a little bit smarter/clearer.

Don't, e.g., show "start a huddle with me" when you're
already in a huddle with me.

(imported from commit 58a646ebcf7ab7f0b2bcc901e9e081cce782ee46)

zephyr/jstemplates/userinfo_popover_content.html

@@ -5,9 +5,11 @@
       <i class="icon-share-alt"></i> Reply to this {{#if is_stream}}stream{{else}}huddle{{/if}}
     </a>
   </li>
+  {{#unless is_personal}}
   <li>
     <a onclick="respond_to_message('personal');">
-      <i class="icon-user"></i> Start a huddle with me
+      <i class="icon-user"></i> Reply to {{sender_short_name}} only
     </a>
   </li>
+  {{/unless}}
 </ul>