Both Introduction to Japanese and Introduction to British Sign Language (BSL) are courses currently in development.
If you can’t wait for the course release, you can catch the tester material on the LT YouTube channel.
This material often differs wildly from the final product and is likely to contain the odd discrepency, but it’s there if you want to get learning as soon as possible! And make sure you subscribe to hear about new uploads!
To speed up the progression of these courses, you can reach out to native speakers of Japanese and/or BSL and invite them to volunteer to help me develop the courses more quickly!