Show chapter progress at last page of each chapter

[tompurker]

Last page of each chapter: Show this information:

1. How many exercises attempted (within the chapter)
2. How many points gained (within the chapter).

The element should either be integrated into the end of chapter navigation element ( 'Impressive! You've reached the end of this chapter.') or should be a block that takes considerably less space than the current progress summary.

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Eva: "There will be an overview of achieved points and completed exercises at the end of each chapter"