This site is dedicated for demoing multilingual child theme of twenty nineteen (bundled with WP 5.x). The source are available here in GitHub.
It is powered by WP 5.2 and latest release of xili-language v 2.23.x. The multilingual plugin’s sources (more than 15000 lines) were rewritten with WP php coding recommandations. (Sublime’s wp formatting plugin with phpcs).
Xili-dictionary and xili-tidy-tags plugins are also full rewritten. (As xili-language, available in GitHub and svn (dev parts).