Role labels translations

[justintadlock]

There was a PR for translating roles on the user edit/new screen. However, are role labels translated anywhere since 2.0.0? Looking back through the code changes, I don't see where they should be getting translated except in one place.

I'm thinking that maybe we should run members_translate_role() over each role label on their registration in members_register_default_roles(). That way, the translations trickle down to any code that calls the label.

[justintadlock]

Roles are actually registered at line 383: https://github.com/WordPress/WordPress/blob/5f7a5c1246e3e6a76c5746e27d3b51a5ed51bfce/wp-settings.php#L383

That's a few lines before the core WP textdomain gets loaded at 396: https://github.com/WordPress/WordPress/blob/5f7a5c1246e3e6a76c5746e27d3b51a5ed51bfce/wp-settings.php#L396

One way of handling this might be through the __get() magic method on Members_Role. When $label is returned, we could translate it on the fly.