diff --git a/media/admin.py b/media/admin.py
index bbc06d2..47d19d2 100644
--- a/media/admin.py
+++ b/media/admin.py
@@ -18,9 +18,10 @@ class AuteurAdmin(VersionAdmin):
 
 
 class MediaAdmin(VersionAdmin):
-    list_display = ('title', 'authors_list', 'side_title', 'isbn',
+    list_display = ('title', 'authors_list', 'side_identifier', 'isbn',
                     'external_link')
-    search_fields = ('title', 'authors__nom', 'side_title', 'subtitle', 'isbn')
+    search_fields = ('title', 'authors__nom', 'side_identifier', 'subtitle',
+                     'isbn')
     autocomplete_fields = ('authors',)
     date_hierarchy = 'publish_date'
     form = MediaAdminForm
@@ -31,8 +32,11 @@ class MediaAdmin(VersionAdmin):
     authors_list.short_description = _('authors')
 
     def external_link(self, obj):
-        return format_html('<a href="{}" target="about:blank">{}</a>',
-                           obj.external_url, obj.external_url)
+        if obj.external_url:
+            return format_html('<a href="{}" target="about:blank">{}</a>',
+                               obj.external_url, obj.external_url)
+        else:
+            return "-"
 
     external_link.allow_tags = True
     external_link.short_description = _('external url')
@@ -59,8 +63,8 @@ class MediaAdmin(VersionAdmin):
 class EmpruntAdmin(VersionAdmin):
     list_display = ('media', 'user', 'date_emprunt', 'date_rendu',
                     'permanencier_emprunt', 'permanencier_rendu_custom')
-    search_fields = ('media__title', 'media__side_title', 'user__username',
-                     'date_emprunt', 'date_rendu')
+    search_fields = ('media__title', 'media__side_identifier',
+                     'user__username', 'date_emprunt', 'date_rendu')
     date_hierarchy = 'date_emprunt'
     autocomplete_fields = ('media', 'user', 'permanencier_emprunt',
                            'permanencier_rendu')
diff --git a/media/forms.py b/media/forms.py
index 7f0b089..2fb16e6 100644
--- a/media/forms.py
+++ b/media/forms.py
@@ -33,10 +33,9 @@ class MediaAdminForm(ModelForm):
             data = data['ISBN:' + isbn]
 
             # Fill the data
-            # TODO implement authors
+            # TODO implement authors, side_identifier
             if data['title']:
                 self.cleaned_data['title'] = data['title']
-                self.cleaned_data['side_title'] = data['title']
             if data['subtitle']:
                 self.cleaned_data['subtitle'] = data['subtitle']
             if data['url']:
diff --git a/media/locale/fr/LC_MESSAGES/django.po b/media/locale/fr/LC_MESSAGES/django.po
index 5b7b3ef..6eebe05 100644
--- a/media/locale/fr/LC_MESSAGES/django.po
+++ b/media/locale/fr/LC_MESSAGES/django.po
@@ -3,7 +3,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-08-11 10:39+0200\n"
+"POT-Creation-Date: 2019-08-11 10:46+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -13,19 +13,19 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
 
-#: admin.py:31 models.py:20 models.py:51
+#: admin.py:32 models.py:20 models.py:51
 msgid "authors"
 msgstr "auteurs"
 
-#: admin.py:38
+#: admin.py:39
 msgid "external url"
 msgstr "URL externe"
 
-#: admin.py:78
+#: admin.py:79
 msgid "Turn back"
 msgstr "Rendre"
 
-#: admin.py:81
+#: admin.py:82
 msgid "permanencier rendu"
 msgstr ""
 
@@ -58,7 +58,7 @@ msgid "external URL"
 msgstr "URL externe"
 
 #: models.py:46
-msgid "side title"
+msgid "side identifier"
 msgstr "côte"
 
 #: models.py:54
diff --git a/media/migrations/0020_auto_20190811_1047.py b/media/migrations/0020_auto_20190811_1047.py
new file mode 100644
index 0000000..3f85a69
--- /dev/null
+++ b/media/migrations/0020_auto_20190811_1047.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.2.4 on 2019-08-11 08:47
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('media', '0019_auto_20190811_0919'),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name='media',
+            old_name='side_title',
+            new_name='side_identifier',
+        ),
+    ]
diff --git a/media/migrations/0021_auto_20190811_1047.py b/media/migrations/0021_auto_20190811_1047.py
new file mode 100644
index 0000000..ecdb34d
--- /dev/null
+++ b/media/migrations/0021_auto_20190811_1047.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.2.4 on 2019-08-11 08:47
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('media', '0020_auto_20190811_1047'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='media',
+            name='side_identifier',
+            field=models.CharField(max_length=255, verbose_name='side identifier'),
+        ),
+    ]
diff --git a/media/models.py b/media/models.py
index a4a8776..5c86ce8 100644
--- a/media/models.py
+++ b/media/models.py
@@ -42,8 +42,8 @@ class Media(models.Model):
         blank=True,
         null=True,
     )
-    side_title = models.CharField(
-        verbose_name=_('side title'),
+    side_identifier = models.CharField(
+        verbose_name=_('side identifier'),
         max_length=255,
     )
     authors = models.ManyToManyField(