Add find medium link in explore dropdown

media/urls.py

@@ -11,5 +11,5 @@ app_name = 'media'
 urlpatterns = [
     url(r'^retour_emprunt/(?P<empruntid>[0-9]+)$', views.retour_emprunt,
         name='retour-emprunt'),
-    path('find/', views.FindMediumView.as_view()),
+    path('find/', views.FindMediumView.as_view(), name="find"),
 ]

theme/templates/admin/base_site.html

@@ -30,6 +30,7 @@ SPDX-License-Identifier: GPL-3.0-or-later
                 <span class="dropdown">
                         <a href="{% url 'admin:index' %}">{% trans 'Explore database' %}</a>
                         <span class="dropdown-content">
+                            <a href="{% url "media:find" %}">Recherche ...</a>
                             {% for app in available_apps %}
                                 {% for model in app.models %}
                                     {% if model.admin_url %}