Add information to exam / summary submission
One-sentence description
Add some confirmation message when submitting an exam.
Motivation
Currently there is no confirmation when you submit an exam + it doesn't show up in the list of exams immediately because there's a review first. This way it is not clear whether the submission was actually performed correctly + people don't know that an submission is manually checked before being published.
Desired functionality
Inform people whether their submission was succesful and why it isn't immediately visible.
Suggested implementation
Show a message thanking someone for their submission, also informing them that it will be published after a review.
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