anarelle on "[Theme: Customizr] Menu Title on Mobile"

Thanks for the great contribution.
However, I don't find the class-header-menu.php file. Maybe it's no longer part of the current WP version (3.8.1)?
I can't see a btn-navbar class in the CSS, so I guess there was indeed a change.

What needs to be changed and where so we can still apply this "hack" to the menu button?

Thanks!