Update Recaptcha to v2

[jesusbagpuss]

Resolves #354

This PR:

• removes the V1 API calls
• adds V2 API calls
• updates phrases
• adds an example cfg.d file

@phluid61 - also relates to https://github.com/QUTlib/eprints/tree/feature/recaptchav2

[prazetyo]

Hi,
When I'm running this script on eprints 3.3.16 why there is an error like this :

JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this) at /usr/share/eprints3/perl_lib/EPrints/MetaField/Recaptcha.pm line 128.\n

Maybe someone can help me? thank you.

[thisnugroho]

Hello there, i still facing the same issue with this error

JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this) at /usr/share/eprints3/perl_lib/EPrints/MetaField/Recaptcha.pm line 128.\n

i've done fetching the latest update of Recaptcha.pm then restarting apache2 and reload the eprints,but still not able to do registration,,

Maybe i did something wrong,can someone help me ?

Thanks..