All non-English (i.e. foreign language) documents would need translating. For official documents, this would need to be professionally translated through a verification service – the same as needed with documents required for visa and financial applications and requests.
However, for PEC support, such as correspondence and appointment documents we would accept an auto-translated to English version of them, if they are also accompanied by the original non-English version so they may be independently verified.
For example, the ‘google lens’ app service (on iOS & Android) can translate and provide an image screenshot of the translated document while maintaining the original document layout. If this image of the translated document is also included with the original document then it would typically be accepted with the application.