Change appearance Secondary Menu Toggle (on mobile)

Sure, that actually is possible with the use of a CSS psuedo-element. Try this code out:

#toggle-secondary-navigation:after {
  content: 'MENU';
  font-weight: 600;
}
#toggle-secondary-navigation i {
  display: none;
}
.secondary-toggle .toggle-secondary-navigation {
  transform: none;
}

The word ‘MENU’ above can be changed to any other text if you want to try something else out.

Ben, you are really great! thanx a lot!

is it also possible to make the Menu font Bold and also Montserrat?

and also to remove the //

The MENU text is actually bold already, but switching to Montserrat will give a bolder look since it’s a thicker font than Raleway.

To switch the font, I would recomment either Easy Google Fonts or Tracks Pro. I recently published a tutorial you can follow for using EGF.

Lastly, the slashes before the menu can be removed like this:

.menu-secondary-items:before {
  display: none;
}