Order detail: Set correct language for invoice email (Z#23197863) (#5260)

src/pretix/control/views/orders.py

@@ -548,6 +548,7 @@ class OrderDetail(OrderView):
 
         unsent_invoices = [ii.pk for ii in ctx['invoices'] if not ii.sent_to_customer]
         if unsent_invoices:
+            with language(self.order.locale):
                 ctx['invoices_send_link'] = reverse('control:event.order.sendmail', kwargs={
                     'event': self.request.event.slug,
                     'organizer': self.request.event.organizer.slug,