Not to undermine its merit, but most of the dirty work and heavy lifting is done by its dependencies:

https://github.com/kennethreitz/maya/blob/d57a78c6bc6b5295f7...

And i18n support in humanize is a bit lacking, as it only translates to French, Korean and Russian. Given that most of the translations needed to render human dates can be found in the CLDR database, maintaining their own looks like a bit of a wasted effort.

Reference:

http://cldr.unicode.org/