make django-helpdesk more customizable + bug fixes:

- look at settings.py for all new options regarding customization.
- settings can be accessed inside the templates via the new
  templatetag 'load_helpdesk_settings'

- allow editing of personal followups, but only if followup does not
  contain any ticketchanges - otherwise this information is lost after
  the editing.
- add 'delete' link to attachments
- link to list of closed tickets in queue overview
- add 'closed & resolved' section to dashboard
- hide 'pre-set reply' box if no pre-set replies are found.
- use 'SelectDateWidget' for custom DateField

- fix how we update followups so that attachments don't get deleted
- fix bug where resolution emails contained the solution 'None'
- fix stats crashing bug
- fix locale bug

helpdesk/lib.py

@@ -54,7 +54,13 @@ def send_templated_mail(template_name, email_context, recipients, sender=None, b
     import os
 
     context = Context(email_context)
-    locale = context['queue'].get('locale', 'en')
+
+    if hasattr(context['queue'], 'locale'):
+        locale = getattr(context['queue'], 'locale', '')
+    else:
+        locale = context['queue'].get('locale', 'en')
+    if not locale:
+        locale = 'en'
 
     t = None
     try: