How do you track progress/completion on a course with multiple languages?

I'm running into the same issue. I have created a template for use in Storyline where one landing page slide has a language selector drop-down with pre-set languages. Based on the one you choose, it launches the scene in the same story file that contains the module in its entirety in whatever language they select. It currently works with 9 languages inside a single .story file, with the only outstanding need being ability to track which language they selected and completed. It currently just reports the completion in a report. Has there been a solution, any possible packaging or grading setting that might be leveraged perhaps by adding a trigger of some sort to each of the scenes' quiz completion slides?