feat(back): single email for each course(#31, based on !23)

Julian Ammouche Ottosenrequested to merge
31-single-email into dev

Students only get one email per course if they have multiple units that need reflecting.

Because of this I also had to change the email template.

This PR is based on the merge of !23 (merged) , so resolve that one first.

Closes #31 (closed)

Edited by Julian Ammouche Ottosen

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