blog/themes/Flex/templates/partial/flex.html

<p>{{ _('Powered by %(pelican_url)s - %(flex_url)s theme by %(alexandrevicenzi_url)s',
  pelican_url='<a href="http://getpelican.com" target="_blank">Pelican</a>',
  flex_url='<a href="https://github.com/alexandrevicenzi/flex" target="_blank">Flex</a>'|safe,
  alexandrevicenzi_url='<a href="http://alexandrevicenzi.com" target="_blank">Alexandre Vicenzi</a>'|safe) }}</p>