Fix locale of download reminder email

src/pretix/base/services/orders.py

@@ -646,6 +646,7 @@ def send_download_reminders(sender, **kwargs):
             if not all([r for rr, r in allow_ticket_download.send(e, order=o)]):
                 continue
 
+            with language(o.locale):
                 o.download_reminder_sent = True
                 o.save()
                 email_template = e.settings.mail_text_download_reminder