Update to use next vehicle in new order

In Order renewal process, use next vehicle in new order when it is available.
Update finnish translation.

Author: mhieta

locale/fi/LC_MESSAGES/django.po

@@ -594,7 +594,7 @@ msgid "Unit price"
 msgstr "Tuotteen hinta"
 
 msgid "Payment unit price"
-msgstr "Maksun tuotteen hinta"
+msgstr "Maksun hinta"
 
 msgid "Quantity"
 msgstr "Määrä"

parking_permits/models/order.py

@@ -317,7 +317,8 @@ def create_renewal_order(
             new_order.save()
 
         for permit in customer_permits:
-            new_order.vehicles.append(permit.vehicle.registration_number)
+            vehicle = permit.next_vehicle if permit.next_vehicle else permit.vehicle
+            new_order.vehicles.append(vehicle.registration_number)
             new_order.save()
             start_date = tz.localdate(permit.next_period_start_time)
             end_date = tz.localdate(permit.end_time)
@@ -354,7 +355,6 @@ def create_renewal_order(
                         "Error on product date ranges or order item date ranges"
                     )
 
-                vehicle = permit.next_vehicle if permit.next_vehicle else permit.vehicle
                 is_low_emission = vehicle.is_low_emission
                 unit_price = product.get_modified_unit_price(
                     is_low_emission, permit.is_secondary_vehicle