Support for all the interpretations was terminated when CC had to give up use of the interface. All newer courses use an interface from a different licensor and to date, no translations have been published. Whatever translated courses do still exist may or may not function as expected.
Bottom line, if you can find some lessons that you are able to complete, then add them to your progress and take from them what you can learn.
We are told that translations will happen when a suitable partner is found. It is a complex undertaking to replicate a course in another language, not the least of which is writing the SCT.