Both Rise and Storyline only allow you to use one language for the course's text labels. (Text labels are the default messages the program uses, such as when it asks the user if they want to resume a course, or warns a user if they click the Submit button before answering a question.)
Thus, it is best to use a separate course for each language. That's the only way to ensure the users will see everything in their chosen language.
There are folks with JavaScript skills who could combine those separate SCORM packages into one package that allows the user to select their language. (I don't have anyone to recommend. I just know this is possible.)