Add an option to hide recaptcha badge

Oki I've refreshed the branch and moved the code a little,
generally passed into the addSubmitHandler() so we can have it in one place.
If the form contains actions element, which is a case for most of Form API forms, the policy markup will be attached as a prefix of the actions element, otherwise we will do a fallback and put that text at the bottom of form.
No matter which case will apply, I believe that for each specific project a bit of project-specific will be needed anyway, so this code should be enough on the module's side of things

The functionality works well, the only thing that I noticed is that I needed to perform a cache clear after changing the setting. RTBC !

Looks good now, tested it on several forms and works well. Thanks!

Okey the code is now merged, I'll create new release in few minutes

New release is ready: https://www.drupal.org/project/simple_recaptcha/releases/8.x-1.0-beta8 →
thanks for work and testing every1!

Automatically closed - issue fixed for 2 weeks with no activity.