Hey, @Deomid_Fedorov, welcome to Meta 
If you check the browser console, you’ll see something like this
ReferenceError: hbs is not defined
but even if you fix that, you would still have problems getting this to work because templates are supposed to be precompiled on the server, not the client-side.
We many ways to customize the header. If you let me know what you’re trying to do, I can probably share a way for you to achieve the result you want.