Bad Persian/Arabic font in WhatsApp web

I am using Ubuntu 20.04.01 L.T.S and after a while installing it, WhatsApp web Persian fonts changed to something really annoying, and the problem is I don't know whether its from Ubuntu, or WhatsApp web because I tried with another browser but nothing changed.

Can anybody help me change this bad font to another better Persian/Arabic font? Look at the picture:

When I use locale command, the output is:

    LANG=en_US.UTF-8
    LANGUAGE=
    LC_CTYPE="en_US.UTF-8"
    LC_NUMERIC="en_US.UTF-8"
    LC_TIME="en_US.UTF-8"
    LC_COLLATE="en_US.UTF-8"
    LC_MONETARY="en_US.UTF-8"
    LC_MESSAGES="en_US.UTF-8"
    LC_PAPER="en_US.UTF-8"
    LC_NAME="en_US.UTF-8"
    LC_ADDRESS="en_US.UTF-8"
    LC_TELEPHONE="en_US.UTF-8"
    LC_MEASUREMENT="en_US.UTF-8"
    LC_IDENTIFICATION="en_US.UTF-8"
    LC_ALL=

You need to add Persian Locale, to do that run sudo apt-get install language-pack-fa command, this will fix not only WhatsApp Web but so many other things in your system..., if your having this issue for any other languages, you must replace -fa with your own language locale code in above command. you can find your language code in this link: https://docs.plesk.com/en-US/12.5/localization-guide/appendix-locale-codes.64474/