Axel Guckelsberger

Another candidate: https://mochajs.org/

This is already possible. User registration supports events (`UserFormAwareEvent`) and also UI hooks. The core won't provide such an anti spam module though. This is something for a separate module/project....

I'd prefer a separate module which provides different methods which a site admin can choose: e.g. a multilingual question, a math exercise, recaptcha, etc.

Where is the problem in creating another 3rd party module instead of creating another core module?

https://github.com/Gregwar/CaptchaBundle

Good questions! About points 1 and 3 see also #3227.

I removed this condition to make it work: https://github.com/matcornic/hugo-theme-learn/blob/master/layouts/partials/footer.html#L16

closing as won't fix - core 4 is not doing anything related to authentication anymore in favor of vendors

Closing as translation management has changed in 4.0

Extraction basically done in 68245a430 but still subject to change. Closing for now.