To change the language on Facebook, follow these steps:
Log in to your Facebook account.
Click on the down arrow icon at the top right corner of the screen.
Select "Settings & Privacy" and then click on "Settings."
On the left side of the screen, click on "Language and Region."
Find the "Language" section and click on "Edit" button.
Choose the language that you want to use from the drop-down list.
Click on the "Save Changes" button.
Facebook will then reload and display the site in the language you selected. If the language you want is not in the list, you can add it by clicking on the "Add Language" button and selecting the language you want to add.
Keep in mind that changing the language setting on Facebook only affects your account and the interface that you see. It does not translate the content posted by other users, so you may still see posts in other languages on your News Feed.