How to automatically replace one header in Fiddler in all requests to a specific site?

Question

Software testing

It is necessary to replace the Accept-Language header in all requests to a specific site. Charles managed to do it.
In Fiddler, it's only possible in manual mode, including breakpoints (F11) and editing the title to the desired one and then launching it. But it's very inconvenient.
The Composer tab doesn't seem to be suitable for this. I feel that I need to use the FiddlerScript tab, but since I don’t know JS, I’m afraid to experiment there somehow.

Answer 1

In Fiddler you can also https://youtu.be/9NmNBFiyRk0?t=3m4s