I don't think you can change the language in the programs individually, at least you didn't use to be able to. If am wrong I am sure someone here can correct me. You can however change the language for all the programs via the settings in the CC app.
I had a similar need, being a teacher teaching both in the Swedish and English versions of the programs. I simply installed one language on my laptop and the other on my desktop. Maybe won't work for your need, but a tip none the less..
I'll try what you've written.
Thank you very much anyway.