You can try reinstalling the application with the computer installed in English.
Another idea, if you are on a poppy, you can try right-clicking on the application and show the contents of the package. This folder will contain some localization options. You can try replacing the contents of Contents/Resources/it.lproj with some English folder. If you try this, create a copy of your Flash version because you can break it, and I am not responsible for what happens!
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