File uploading, wrong label language

Hi All,
I’m facing a problem with the contact form when adding the form-tag for file uploading. The language settings of my website is English, I could correctly edit a contact form by adding different fields and they are all displayed in English. Nevertheless, if I add a form-tag for file uploading, the corresponding field is added to the contact form but the label is put as default in Italian and not in English. I couldn’t find a way to solve this issue. Any suggestion to fix this problem?
Thanks in advance!

Paola