feat(models): add Poster label verbose_name

Add German `verbose_name` for `Poster` entity field `label`.

Closes: #50

apis_ontology/migrations/0012_alter_poster_label_alter_versionposter_label.py

@@ -0,0 +1,26 @@
+# Generated by Django 5.1.3 on 2024-12-02 09:41
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("apis_ontology", "0011_alter_event_options_alter_versionevent_options"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="poster",
+            name="label",
+            field=models.CharField(
+                blank=True, default="", max_length=4096, verbose_name="Titel"
+            ),
+        ),
+        migrations.AlterField(
+            model_name="versionposter",
+            name="label",
+            field=models.CharField(
+                blank=True, default="", max_length=4096, verbose_name="Titel"
+            ),
+        ),
+    ]

apis_ontology/models.py

@@ -229,7 +229,12 @@ class Poster(BaseEntity):
     viewers/readers/the general public.
     """
 
-    label = models.CharField(blank=True, default="", max_length=4096)
+    label = models.CharField(
+        blank=True,
+        default="",
+        max_length=4096,
+        verbose_name=_("Titel"),
+    )
 
     class Meta:
         verbose_name = _("Plakat")