In that case the year is added to be able to tell the difference, so sonarr is working as expected. Other shows with unique names will not have the year in your naming scheme.
At the moment sonarr uses/requires the english metadata (series info, episode summaries, …) from thetvdb. So you will not be able to tell sonarr that you have downloaded the italian version, and can’t make sonarr rename the files to include the italian episode titles…