You don't need to modify any files. You can overwrite css in Theme options > Layout > Custom CSS & JS > Custom CSS section. But please send us url to your website where this button is.
As we see, your website does not render fonts properly and at first you must contact with your hosting administrator because as you can see on http://snag.gy/dt5Vl.jpg CORS is not enabled on your server. More information about this library you can read on http://enable-cors.org/server.html
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Comments
you can change on Text only and this can be done in Theme options > Layout > Menu & Action Bar section. Field is named Menu | Responsive Button | Text
But you can also try to do one thing. Instead of text you can use html for icon and maybe this will work: