How are languages managed during the conclave?

During a conclave, the participants (cardinals) come from all over the world. Is there a *lingua franca* which they are all expected to master at least at a conversational level? (I am guessing that this would be Italian, or English, or (probably not) Latin). Or are they expected to somehow manage between themselves, though overlapping language capacities? (A speaks Italian, B speaks Italian and French, C speaks French - so after some gymnastics A, B and C can be more or less synchronized). I do not believe they have translation services for confidentiality reasons.