You can understand 90% of cards without text once you know the iconography. Some cards will have show an asterisk with the icons though, denoting that there are exceptions to the normal rules explained in the text. In particular, many cards that place tiles break the normal tile placement rules.
I was going to say the same thing. It's primarily the asterisk (*) cards that require the text. All other cards can be understood from the symbols only.
There are not a lot of asterisk cards, so maybe someone can translate just those cards into Italian and post it here on BGG.