Add additional language pack to windows 10 and change display language

1. In the Search box, type Add a language, and then tap or click the result Add a language to open it.
2. In the Language dialog box, tap or click Add a language. Scroll to select the language you want from the list, or use the search box to search for a language.
3. Tap or click the language you want to install, and then tap or click Add.
4. To add the language as a display language, tap or click Options. If a language pack is available for your language, tap or click Download and install language pack.
5. To switch to the newly installed display language, you’ll need to make it your primary language by clicking Make this the primary language.

Note: To change windows display language, you’ll need to log off of Windows, and then log on again for the change to take effect.