Exercises: after complete all, open page with progress statistic

[ApayRus]

After user have completed all exercises:

• open page with results, as in games: how many words did have you read, translated, listened etc...
• highlight all errors, like work on errors, so you can improve your knowledge for next time.
• add images (in addition to text, translation and audio). Look at image and choose right answer from texts etc...
• add ability to combine multiple things together, like image+text, or image+audio, etc... (we should design markup for it)
• make hidden materials, if you want user exercise with them, and didn't see answers before. Hidden material eg oneLineOneFile, just makes connection originalText-translationText-Image-Audio --> so then you can generate from them exercises. And you don't want to show this material in non exercise format...
• user input tolerance -- design and implement separate module. First: case insensitivity, punctuation and spaces ignoring. Some rules are general for any language, and some -- specific for the particular language, like ignore stress in Russian, or diacritics in Arabic.