Add Administration link in menu for staff users

coin/templates/menu_items.html

@@ -5,6 +5,7 @@
 <li class="{% ifactive 'members:invoices' %}active{% endifactive %}"><a href="{% url 'members:invoices' %}">Mes factures</a></li>
 <li class="{% ifactive '' %}active{% endifactive %}"><a href="/members/contact/">Contact / Support</a></li>
 <li class="divider"></li>
+{% if user.is_staff %}<li><a href="{% url 'admin:index' %}">Administration</a></li>{% endif %}
 <li class="{% ifactive 'members:password_change' %}active{% endifactive %}"><a href="{% url 'members:password_change' %}">Modifier mon mot de passe</a></li>
 <li class="divider"></li>
 <li class="{% ifactive '' %}active{% endifactive %}"><a href="{% url 'members:logout' %}">Déconnexion</a></li>