First of all, please use Google translate while typing things if you don't speak English. It can be very hard to moderate the site when multiple languages are used.
Sorry for the inconveniences caused.
As for the add to library button, it works well for me.
I would suggest posting what browser you use here.
Also, have you been clicking on the Reading button after pressing Add to Library?
Sorry for the inconvenience caused.
1- Yes, I tried to make money in different languages but it doesn’t always work in English, I was able to add one first yesterday and today just after I cleared all the caches and restarted google, it seems to start working