Listing Words from your Mother Tongue you'd like to Learn in your New Tongue
I'd like to suggest that we be able to pick words we want to learn in our new language. These could be prioritised, so that the system will be more interested in seeing that we learn them and learn to master them.
If you're keen on baseball, you'll want a selection of words related to the sport, for example. Each of us will find some words far more used and useful than others, I feel, once we get past basic grammar and communication.