By default, the language of your Android device is the language of your WhatsApp account.
If you want to change the language of the WhatsApp only, then follow the below steps:
That's it. All done.
Note that this option is not available for all countries.
If you don't see this option, then you need to change the language of your Android device to change the language of WhatsApp.
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How to Change Language in WhatsApp