How to change macOS Safari default language

If you want to change the default language of the macOS Safari web browser, you can follow the below steps,

⚠️ Note: This will change the default language of all the 
 applications to the one you set as primary.

1. Close Safari,
2. Now go to Apple Menu: System Preferences...,
3. Click on Language & Region,
4. Click on + sign to add new Region,
5. Select a prefered language,
6. Click on Add,
7. You will see a prompt based on what you select: Would you like to use English (US) as your primary language?: When changing your primary language, some applications may not use the new language until your computer is restarted.
8. You may have to restart the system to apply the changes.