Option to setup reCAPTCHA to protect signup, login and feedback forms

[ivancarlosti]

/t

[pglombardo]

Hi @ivancarlosti - I agree/this is overdue. Created #2078

[pglombardo]

Not an exact address to this FR but there is also https://github.com/markets/invisible_captcha

[pglombardo]

This is a start: #2173

Going with something simpler than recaptcha for the time being.

[pglombardo]

First release v1.41.0 is out with the captcha applied to the new user registration form only. If no problems, I'll extend it to the other public forms.