Changing the language in the Perch Admin

Hi, I've just installed Perch on a live server on the internet and it was a piece of cake! Many thanks. But I'm an English speaking Kiwi, while the admin intent on editing small sections, on a page, of the existing website, is an Italian. I see in the settings under Editing General Settings a select/dropdown reading but it only offers en-gb. Where and how do I get it-it? Cheers