Fix adding participants by identifier to course

Closes #737 (closed) . Because the person table is created once and then updated dynamically based on what the user types, adding the click listeners for the buttons for adding participants on DOMContentLoaded does not work, as the table only "loads" once. Adding a method for onclick solves it.

added typebug + 1 deleted label

requested review from @rwbackx, @aturgut, and @dsavvidi

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changed title from Don't add event listeners on DOMContentLoaded to Fix adding participants by identifier to course

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approved this merge request

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merged

mentioned in commit 7d9fc4f0