Put class/instance/huddle-recipient names in the title tag.

That way you can at least see them by hovering on them if they're
too long. (I'd probably like a better solution long-term,
but this'll do for now.)

(imported from commit 8628be101475ea72865bcaeda7d7f5cfe6453931)

zephyr/jstemplates/zephyr.html

@@ -23,14 +23,17 @@
 <tr class="recipient_row">
     <td colspan="2"
         class="zephyr_label_clickable zephyr_newstyle_class"
-        onclick="select_zephyr_by_id({{id}}); narrow_class();">{{display_recipient}}</td>
+        onclick="select_zephyr_by_id({{id}}); narrow_class();"
+        title="{{display_recipient}}">{{display_recipient}}</td>
     <td class="zephyr_label_clickable zephyr_newstyle_instance"
-        onclick="select_zephyr_by_id({{id}}); narrow_instance();">{{instance}}</td>
+        onclick="select_zephyr_by_id({{id}}); narrow_instance();"
+        title="{{instance}}">{{instance}}</td>
 </tr>
 {{else}}
 <tr class="recipient_row">
     <td colspan="3" class="zephyr_label_clickable zephyr_newstyle_pm"
-        onclick="select_zephyr_by_id({{id}}); narrow_by_recipient();">Huddle with {{display_reply_to}}</td>
+        onclick="select_zephyr_by_id({{id}}); narrow_by_recipient();"
+        title="Huddle with {{display_reply_to}}">Huddle with {{display_reply_to}}</td>
 </tr>
 {{/if}}
 {{/include_recipient}}