@terry About Japanese translation, Inada Naoki is the coordinator, their repository is created (https://github.com/python/python-docs-ja) they just have to push now.

Once this language switch fully tested / implemented / released, it will be easy to add a language. Rules to add a language to the picker are described in PEP 545 (translation have to meet criterias like having a fully translated tutorial).

Spannish translation exist too, here https://github.com/PyAr/tutorial/commits/master but I don't remember if they contacted us about porting it to docs.python.org.

FYI I try to document which language is at which step of landing to d.p.o here: https://mdk.fr/blog/python-documentation-translation.html, coordinators are documented here: https://docs.python.org/devguide/experts.html#documentation-translations

FTR I'm currently testing the new switchers locally, I should be able to remove the "WIP" soon.