I just want to share that I appreciate the last updated layout on iOS, at the end of each lesson.
It’s much better now, all info is well displayed and it’s more motivating to check details at the end of each lesson.
I also appreciate the pop-up window for removing lessons. I hope this has been done to improve or even avoid for good any ghost lessons we had after deleting. I perceived you already found some workaround before, and I assume this is another step forward. It looks neat! 
Thank you!