Registration should not automatically redirect to wordpress.org

[dd32]

Certain pages on login.wordpress.org will redirect to wordpress.org when they're viewed unexpectedly.

The ​page that raised this, was the registration confirmation screen, but a better example that's easily visible is ​https://login.wordpress.org/lostpassword which redirects to wordpress.org without any suggestion as to why.

[dd32]

In 11045:

Login: Add an additional layer of redirect location rememberance to the login site.

This should help the login site recall the redirect_to location even when Jetpack's brute-force protections kick in.

See #5754.

[dd32]

In 11046:

Login: When a user is logged in, or an account creation link has already been used, redirect the user more appropriately to a page explaining the issue.

This removes a "random" redirect on certain Login pages that would result in the user redirected to the WordPress.org homepage, or support forums, with no further explanation.

Fixes #5754.

[dd32]

In 11049:

Login: Consistently use log in as a verb, and login as a noun. Same for log out.

See #5754.