Which software are you using? Simatic Manager, or Portal? Which version?
Either way, there should be a way to export all texts to csv files. That way you can open them in excel and have one column for the existing Italian and one column for English.
Hallo Prince
the previous mail is right export the documentation
make sure your source and target language are set correct
I prefer excel
you will get several files symbol / block header / comment / ..
take each file and translate only the column of the foreign language
make sure the original language and foreign language column are
equal length
when done import the files back into the project and change language