React's usage of ES2015 Map and Set breaks older browsers (especially IE) (2)

Since our front-end dependencies got updated Quizzard is not working anymore in Internet Explorer. This is because we updated to React v16 which uses the Set and Map features of ES2015, which are not available in Internet Explorer (or not implemented according to spec as is the case with Internet Explorer 11).

Internet Explorer support will be fixed by using some generic polyfill for this, as described on https://reactjs.org/docs/javascript-environment-requirements.html

To do

Add the polyfill to fix the front-end in Internet Explorer (1).
Test if this actually works in Internet Explorer (1).

Edited Jul 25, 2018 by Remco de Man

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