Go into your QQ Catalyst Account> Contacts Tab> and select the contact you wish to set a preferred language for.

In their profile, scroll down to Personal Information> Press Edit> and click the Preferred Language drop down to choose a language> Save. In Rocket Referrals, use exactly what is says in QQ Catalyst as the identifier when adding a language. ( ex. English, Chinese etc.)

2.1 Languages included are:

(The language is set to English as a default).