@Nino94,
I have created the video of my test setup. Instead of modifying anything on your site.
In this video, you can see that the course curriculum is translated in the French Language.
video:
https://screencast-o-matic.com/watch/cFQtlBYfMx
Please watch this tutorial and follow step by step:
https://www.youtube.com/watch?v=p6swnVTT7tk
Because I have followed the same.