Automatic text direction input

Hi Ron, I hope you are doing fine these days^^

I’m using your great theme Frontier(looks different after customization) which I found extremely great, probably the best free theme out there^^

In my website I use two languages, How can I automatically set text direction based on input text language? I mean when I guy write in Arabic for example, the text automatically set up to RTL and when they type in English the text direction will be LTR.
I really hope you could help me with my issue, I tried so many fixes but no results >_<! one of them was setting direction to RTL using css.

Have a great time.