Fix some admin columms

src/accounting/admin.py

@@ -43,12 +43,7 @@ class OrderAdmin(admin.ModelAdmin):
     inlines = (OrderProductInline,)
     form = OrderAdminForm
 
-    list_display = ("who", "description", "created", "is_paid")
-
-    @admin.display(description=_("Customer"))
-    def who(self, instance: models.Order) -> str:
-        """Return the full name of the user who made the order."""
-        return instance.member.get_full_name()
+    list_display = ("member", "description", "created", "is_paid")
 
 
 @admin.register(models.Payment)

src/accounting/models.py

@@ -32,7 +32,7 @@ class Account(CreatedModifiedAbstract):
     owner = models.ForeignKey("membership.Member", on_delete=models.PROTECT)
 
     def __str__(self) -> str:
-        return f"Account of {self.owner.get_full_name()}"
+        return f"Account of {self.owner}"
 
     @property
     def balance(self) -> Money: