Application using fastapi-babel to translate responses. Application has to support en and ar translation.

When user send accept-language: en and accept-language: ar API works fine.

But when swagger api page open from client side, its borwser passes Accept-Language: en-US,en;q=0.9,ar;q=0.8,fr-FR;q=0.7,fr;q=0.6.

For my understanding, what is the use of q=X.Y ? and how to configure browser to send only one language as Accept-Language ?

Screenshot from browser