Wrong language on loading page

I have a website (www.incha.eu) which until the weekend was available in Danish (the index page), English and Spanish, which all seems to work fine – as well on my internet server as on my localhost server.
Over the weekend, I have added Italian to my site, translated all pages and added the language in the menu, with the respective language set as primary menu in each individual case.
However, for some reason, when I load the webpage (localhost/incha) on my localhost server, it comes up with localhost/incha/it/iniziale/ (the Italian version) every time!
My computer is set to Danish keyboard and my operating system is set to English version!
Does anyone have any idea about what I am doing wrong?
Thank you all very much in advance for your assistance.

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