antora VS jekyll-multiple-languages-plugin

Unlike docToolchain or Asciidoctor, Antora is a true framework for Asciidoc that can store, retrieve, and aggregate all Asciidoc content from multiple git repositories. Antora’s page referencing system isn’t coupled to filesystem paths or URLs. You are able to cross reference pages across a local machine, a staging environment, and a production environment. To generate a site with Antora, you need the Antora CLI and Antora site generator.

Internationalization (i18n) pain for a documentation project is a process problem, not a feature gap. Documentation frameworks are not meant to translate your developer docs for you into the language of your choice. Some frameworks might offer i18n support, like the Crowdin support in Docusauraus v2. With Jekyll, you have to pick a theme like this one. I doubt if the reST or adoc frameworks would differ much from this process. Besides the framework support, you'll need a localization vendor like lokalise or a community driven platform like Crowdin to actually do the translation. Sébastien goes into great detail in this Docusaurus RFC when discussing i18n support in Docusaurus v2.