{{ _('{date} by {user}')|f(user=object.content_object.creator, date=datetimeformat(object.content_object.created, format='longdatetime')) }}
{% if object.content_object.updated_by %}{{ _('{date} by {user}')|f(user=object.content_object.updated_by, date=datetimeformat(object.content_object.updated, format='longdatetime')) }}
{% endif %}