euscanwww: Watched herds/maintainers/categories panel

* Refactored templates and templatetags
* Added unfavourite views
* Added button to favourite/unfavourite package
* Panel for showing favourited objects

Signed-off-by: volpino <fox91@anche.no>

euscanwww/djeuscan/templates/euscan/accounts/packages.html

@@ -1,15 +1,15 @@
 {% extends "euscan/_datatable.html" %}
 {% load url from future %}
 
-{% load packages %}
+{% load euscan %}
 
 {% block title %}
-  {{ block.super }} - My packages
+  {{ block.super }} - Watched packages
 {% endblock %}
 
 
 {% block content %}
-  <h2>My Packages</h2>
+  <h2>Watched packages</h2>
 
   {% packages packages %}