Is your feature request related to a problem? Please describe.
mkdocs-material already supports a wide range of languages, should be great if this package supports more language rather than manually modifying all the templates or sticking with hard-coded English :)

Describe the solution you'd like
Allowing user to feed a data file (such as JSON/YAML) should be feasible enough. Original text could be used as a polyfill to ensure backward compatibility.

Describe alternatives you've considered
Utilizing the gettext module is also a considerable alternative, but I doubt it will be a little bit harder for end users to tweak them.

Also, we can centralize the translation context in the repositories to provide support for other languages natively.