Integrate Confirmation request and Password reset actions into the new session workflow

[danguita]

Comes up from #126.

What does this PR do?

First of all, this was not specified in the prototype but, after checking the entire workflow I missed some actions that would need to be implemented in order to keep a good experience.

This one implements the Confirmation email request as part of the new session workflow. This means that any User should be able to request a new confirmation email in the new session screen, as follows:

Clicking in "¿Instrucciones de confirmación?" ⬇️

Also, we're integrating the User password change behavior into the new front-end, and any alternative URLs have been dropped from the system actions:

In addition, any new screens are being localised into the three languages available now, so once again I'd need some help from my beloved Catalan translator @ferblape 🙏

How should this be manually tested?

Just get into the login screen at http:https://madrid.gobierto.dev/user/login, and check that:

• The Confirmation request form can be reached from the new session block.
• The Confirmation request works as expected, allowing the User to start a new confirmation process through an informative email.

In addition, let's check that the Password reset feature still works as expected and the Password edit form has the right styling:

• http:https://madrid.gobierto.dev/user/passwords/edit?reset_password_token=<reset_password_token> looks good.

Help wanted ✋

@furilo Does that work for you?

[ferblape]

LGTM!

[danguita]

Thanks for those translations! 🙌 Waiting for the build to pass.