Great question for how to communicate effectively with PSAs from other countries while using SFIM (SFI Instant Messaging.)
I use www.google.com/translate which is what SFI uses on their pages.
Of course, ask if they can speak some English or another language, and you can send messages using both, English and their native language.
If you send messages in English, or your own language, notice what language they use when they message you. Google Translate can detect languages. I find that a great help, especially when receiving emails, team mails or instant messaging.
You can send them an eCard when they are new to ask what language they speak. I always include www.google.com/translate at the top of the page.