The actual LinkedIn widgets can't be translated. Unfortunately, they are loaded over Javascript directly from LinkedIn's site, and there's no way to have them translated to other than English.
As for text that JLinked displays, that can all be translated using the language files that are installed with the extension. In the /language/en_GB/ directory, you can find com_jlinked.ini and mod_sclogin.ini files. You can copy these to the it_IT directory and modify them as you need for whatever language translations you need.
Hope that helps,
Alex