Go to your Routelab account page and change the language to Italian. Then click on Support and you'll see the manuals are in Italian as well.
Small warning while you're in there: it took me ages to get into my Routelab account at all last summer. I was on the road, and hotel and campsite wifi kept dying halfway through the login — I was convinced my account was broken. It was the network, not the site. Put a VPN on the laptop with an endpoint back home and it loaded first try, every time since. Picking one took longer than fixing the problem though, most reviews are just marketing. The roundup on https://kiesly.nl was the only one that actually compared them on speed and stability. Handy if you plan routes from abroad.