Drop dependancies django-picklefield and django-bootstrap3

cas_server/templates/cas_server/logged.html

@@ -1,6 +1,4 @@
 {% extends "cas_server/base.html" %}
-{% load bootstrap3 %}
-{% load staticfiles %}
 {% load i18n %}
 {% block content %}
 <div class="alert alert-success" role="alert">{% trans "Logged" %}</div>
@@ -10,7 +8,7 @@
       <input type="checkbox" name="all" value="1"> {% trans "Log me out from all my sessions" %}
     </label>
   </div>
-  {% bootstrap_button _('Logout') size='lg' button_type="submit" button_class="btn-danger btn-block"%}
+  <button class="btn btn-danger btn-block btn-lg" type="submit">{% trans "Logout" %}</button>
 </form>
 {% endblock %}