I believe the user whitelist functionality was commented out because we couldn't get it to work locally. I had the same issue, though it did work for me at some point... Not sure if it works on production, so I guess let's get it to work locally, test it and redeploy it.
The French version hasn't been set up yet either. I think you can simply create the page and it will work, but let's test it to be sure. We should also have someone translate the instructional text to French.
English version: https://en.wikipedia.org/wiki/User:EranBot/Copyright/User_whitelist
French version (nonexistent): https://fr.wikipedia.org/wiki/User:EranBot/Copyright/User_whitelist