Payment term in minutes (#1760)

Co-authored-by: Raphael Michel <michel@rami.io>

src/pretix/helpers/templatetags/expiresformat.py

@@ -0,0 +1,10 @@
+from django import template
+
+from pretix.base.i18n import LazyExpiresDate
+
+register = template.Library()
+
+
+@register.filter
+def format_expires(order):
+    return LazyExpiresDate(order.expires.astimezone(order.event.timezone))