Give the person a draft copy as you read the agreement aloud. If a mediator is bilingual, try to use both languages at the table. It may also be useful to write the agreement in both languages. Try to have associates or family members come to support the person, and select an uninvolved party to officially translate. Have a private conversation with the translator beforehand about roles and how you will work together.
Translators often become advisors and even de facto decision-makers.
Try to communicate with the parties as directly as you can. Whenever you mediate, remember to routinely summarize aloud the content of any written materials and to read aloud the final agreement before asking people to sign.