The LogMeIn Rescue Applet, Instant Chat, and Calling Card will run in the language selected as the active language on the customer's computer.
If the Applet is not available in the customer's language, the English version will be used.
The Instant Chat panel has a language selector, while the Applet and Calling Card do not.
Assume you are a UK-based technician using Rescue in English. You make contact with a customer in Germany. Your customer is using a German version of Windows, but she has changed her Regional and Language Settings to Turkish. She will see the Applet in Turkish.