Description
When we have several reCaptcha (version 2.0) on same page. Only one is displayed.
It can be a problem if a module want to use the reCaptcha plugin to display his own captcha and we already have one on the page (for example on the user subscription page).

Why do we have this issue ?

This issue is here since : 8da3451

It seems the reCatpcha plugin only render the first reCaptcha div it encounter; as we use the onload mode since this commit.

Defaults to onload, which will render the widget in the first g-recaptcha tag it finds.
(https://developers.google.com/recaptcha/docs/display)

Before the commit we used the explicit method, using some JavaScript to transforming a specific dom node into reCaptcha. So after several call to the plugin we had several reCaptcha.

Don't hesitate to notify me if I wasn't clear enough.