Change the text “NAVIGATION” in responsive menu

Hi,

customers of the domain are struggling to realise that they need to click on NAVIGATE when they view the site on mobile devices to see other pages.

This means they can’t figure out how to book which defeats the object of the site.

The owner has asked me to change the text from NAVIGATE to MENU.

Can this be done?

Thanks

Mark

The page I need help with: [log in to see the link]