To add or change language packs in Windows 10, Time & Language menu in your system settings . Windows 10 language packs allow you to change the display language
Navigate to Language: Go to Time & Language > Language (or Language & region in newer versions). windows 10 language packs
Notes:
Benefits of Windows 10 Language Packs
For advanced users, GUI is slow. Use PowerShell (Admin) to manage language packs. To add or change language packs in Windows
Install: Click Install. The pack will download and install in the background. windows 10 language packs