Part XIII: Dates and Times
http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xiii-dates-and-times
based on moment.js. Need to look into that more, but I don't like the code he uses, so I'm leaving most of the content of this step out.
Part XIV: i18n and l10n
http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xiv-i18n-and-l10n
not completed. just did enough to understand the concept. Need to put the extract / update / compile scripts into a manage.py or something.