PointFire (pointfire.com) is the gold standard of multilingual SharePoint. It works on premise and Online, supports Classic and Modern, and has optional machine translation. Neural “human parity” translation supports modern pages, OneDrive, communication sites, PowerPoint, PDFs, etc.
Imagine if two people who speak different languages follow a link to the same URL, and both see it completely in their language: UI, content, even lists and libraries. Imagine not segregating users by language, but collaborating on a single site. Currently used by over one million users within governments, corporations and NGOs, PointFire products are built for scalability, speed, and flexibility.