Yes, you can translate a marketplace with unlimited languages and can translate almost any text field you can input text into. New languages are found in a separate tab with the exact same fields as your main language. The back-end administration dashboard can also be translated via an open source translation service Transifex.
To help contribute to translating the Shuup back-end, please visit https://www.transifex.com/shuup/shuup/
To launch a multi-lingual marketplace contacts us.