Yeah its a tad strange seeing other parts of the film are translated from Italian to English but this scene is not.

Actually it could be because in GFII, when Young Vito is talking to Fannuci no translation was showing up but then I toggled the Subtitles & on 7/8 or 8/8 the subtitles for that scene shown up. I thought they were automatically meant to come up but they didnt, you might have to do this for this particular scene.