OutSystems UI (and to some extent System) does not implement translations for the "it-IT" locale.
Therefore, internal error messages (eg: "Invalid login") and UI elements (eg: "page" 3 "of" 15) always appear in English even if you set SetLang("it-IT") on your consumer modules.
The request is to translate the resources into "it-IT", or make the dev's able to handle it via Multilanguage Locales.