Hello FredPrager,
Good day! I'm John Dev a Windows user like you and I'll be happy to assist you today. I know this has been difficult for you, Rest assured, I'm going to do my best to help you.
You can add a new language by purchasing an upgrade to Windows 11 Pro.
ms-windows-store://pdp/?productid=BF712690PL0G&ocid=bing_edition_upgrade
Kindly let me know if this helps or if you have any further concerns.
Kind regards,
John DeV
Independent Advisor