There are a lot of WordPress users in Japan. I hope that adding the translation of the documentation will help them with their development.

Add a translation of the WordPress Playground.
Manage the progress of each page.

Japanese documentation
https://wordpress.github.io/wordpress-playground/ja/

How to translate (Japanese)
https://wordpress.github.io/wordpress-playground/ja/contributing/translations/
Translation guide
https://ja.wordpress.org/team/handbook/translation/
https://ja.wordpress.org/team/handbook/translation/translation-style-guide/

The Japanese documentation team customarily leaves the original text commented out and translates it immediately afterwards.
Example:
https://github.com/jawordpressorg/gutenberg/blob/trunk/docs/README.md?plain=1

However, if you put a comment out at the beginning of the md file, the markdown title will be rendered, so write the translated language first, and then write the original text commented out.

Command to compare source text with Japanese

Example: intro.md

diff -y --suppress-common-lines packages/docs/site/docs/main/intro.md packages/docs/site/i18n/ja/docusaurus-plugin-content-docs/current/main/intro.md

Entire main folder

diff -y --suppress-common-lines -r packages/docs/site/docs/main/ packages/docs/site/i18n/ja/docusaurus-plugin-content-docs/current/main/ 

Related #1798

Remaining translation pages