The software allows for any number of languages to be in use on the client side. This allows your clients to see all system text and templates within a language you setup and allow your clients to view on the client side.
Highlights of the Multi-Language Feature:
You can create languages within the system using the following admin tools:
LANGUAGES > LANGUAGE HOME
And manage a few aspects of it within that page like exporting a language for external translation and reimport after translation. You can set a specific template set to a specific language use within this admin tool:
DESIGN > TEMPLATE SETS