word tips at lesson end
At the end of a lesson, when it tell you what words you've strengthened, it would be great if you could hover over the words and see the translation. This way, it could act as a reinforcing double-check at the end.
Not bad, might not get noticed if implented.
A more informative page that overviews the entire lesson you just completed (new words, potential grammer lessons, word weakness, related lesson discussions etc) would be greatly appreciated.