Some tests have shown that the \"hamburger\" button for collapsable menus on mobile devices are mysteries to users and I would like to add the word \"Menu\" next to my Bootstrap
I guess it would be the best to use fontawesome.
simply include the references to fontawesome (see http://fortawesome.github.io/Font-Awesome/get-started/) and then use the bars icon (http://fortawesome.github.io/Font-Awesome/icon/bars/)
So your code would look sth. like that:
[...]
[...]
[...]
If the Bars icon should be bigger, simply add fa-lg
or any other class which can be found at http://fortawesome.github.io/Font-Awesome/examples/ to the icon