While grouping is running: better instruct user by text (reload of page after 2-5min)

[jkonert]

Currently a user waits forever to see a "finished" message on

• "group formation is running" and/or
• "groups are created in moodle"

it would be good to extend the red text to say: "It may take 2-5 min . Please reload the page occasionally to see the result."

long term more advanced: We should have a AJAX REST Backend point that delivers the status by polling to the frondend javasscript to show "success" automatically (and even a progress). More advanced: having a websocket endpoint to prevent polling (better performance).