FIX: do not escape html entities in plain text templates.

dav_events/models/event.py

@@ -553,7 +553,7 @@ class Event(models.Model):
             template_name = 'default.txt'
 
         template_path = os.path.join('dav_events', 'event', template_name)
-        template = get_template(template_path)
+        template = get_template(template_path, using='PLAINTEXT')
         return template.render(self.get_template_context({'show_internal_fields': show_internal_fields}))
 
     def render_as_html(self):