bilingual

1. Write the documentation in English.

2. Change directory to the /docs and input two commands below.

sphinx-build -b gettext ./source ./build/gettext
sphinx-intl update -p ./build/gettext -l zh_CN

3. Fetch the *.po files in /docs/locales and translate as needed.

4. Compile the documentation just in the target language.

sphinx-build -b html -D language=zh_CN ./source/ build/html/zh_CN