Show just surnames for an unnamed family, not "... family"

An unnamed family with distinct member surnames read as "Jones / Smith
family" -- dropping the suffix reads more like an actual family name.

members/models.py

@@ -19,7 +19,7 @@ class Family(UUIDModel):
             return self.name
         surnames = sorted({last_name for last_name in self.memberships.values_list("member__last_name", flat=True) if last_name})
         if surnames:
-            return _("%(surnames)s family") % {"surnames": " / ".join(surnames)}
+            return _("%(surnames)s") % {"surnames": " / ".join(surnames)}
         return _("Family %(id)s") % {"id": str(self.pk)[:8]}
 
     @property

members/tests.py

@@ -87,7 +87,7 @@ class FamilyNameOptionalTests(TestCase):
         FamilyMembership.objects.create(family=family, member=jones, role=FamilyMembership.FamilyRole.CHILD)
 
         # Distinct surnames, alphabetically ordered.
-        self.assertEqual(str(family), "Jones / Smith family")
+        self.assertEqual(str(family), "Jones / Smith")
 
     def test_str_falls_back_to_short_id_when_empty(self):
         family = Family.objects.create()