Show users when they are in an activity streak
You probably know that learning is about habits and persistence. That's why it is good when apps help with maintaining continuous motivation. Duolingo has one good way of doing this: through tracking activity streaks and letting people show off with their achievement in persistence. It's nice to immerse into the race and one day realised that in the meantime you've learned a lot. It would be great if Lexicum had a way to show how many days or weeks in a row I've practiced my vocabulary.