Improve headers above tables on homepage

When not logged in it would show the same header above both the open and
closed tables. This fixes that while also tweaking the header when you
are logged in to be more descriptive of the content.

Author: JelteF

pgcommitfest/commitfest/templates/home.html

@@ -48,7 +48,7 @@
     </tbody>
     </table>
    {%endif%}
-   <h3>{{user.is_authenticated|yesno:"Your personal dashboard,Patches in the current commitfest"}}</h3>
+   <h3>{%if user.is_authenticated%}Open patches you are subscribed to{%elif p.is_open%}Active patches in the current commitfest{%else%}Closed patches in the current commitfest{%endif%}</h3>
    <table class="table table-striped table-bordered table-hover table-condensed">
     <thead>
      <tr>