Expose zh-cn docs, delete bad zh docs, add docs for adding translations (#6855)

Expose zh-cn docs, delete bad zh docs, add docs for adding translations (#6855)

* expose zh-cn docs, delete bad zh docs, add docs for adding translations

* Update docs/translating.md

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>
* Update docs/translating.md

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>
* update for python 3