Hey Armin,
Separating the translation of these specific strings within The Events Calendar from the rest of the strings on your site is unfortunately quite a tricky thing to do.
In fact, I don’t even know how to go about doing this – I’m sorry to disappoint. The best solution would be to look for translation plugins out there that let you do this, or to manually go into The Events Calendar’s core plugin code and replace instances of strings passed through gettext functions like __(), _e(), esc_attr__(), etc., and just replace them with plaintext in English (or Italian, etc.).
This last option is not recommended, but just a possible alternative that I could think of.
Let us know if you have any other questions or concerns Armin, and again, I’m sorry to disappoint here.
George