To build the documentation locally do the following :

 > pip install sphinx sphinx-autobuild
 > cd docs
 > make html

To build the other language(like Chinese version) documentation locally do the following :

 > pip install sphinx sphinx-autobuild
 > cd docs
 > make -e SPHINXOPTS="-D language='zh_CN'" html

This will create the output in _build/html so on Mac you should be able to

> open _build/html/index.html

which will open a browser with the rendered documentation