A curriculum is a group of courses usually in a related topic. Curricula can be Multi-course or Multi-language.
Curricula on UltiPro Learning are by default Multi-course. This kind of curriculum allows you to connect different courses, usually related, and provide your employees with a more comprehensive skill set on a topic.
If you have a course in different languages you can create a Multi-language curriculum. Thus, every user enrolled, would be able to attend the course in the most preferred language.