UI: remove password fields from register dialog

[JayDi85]

Current xmage code uses auto-generated passwords and sends it to emails on registration. No needs in password fields in register dialog. This confuses users.

TODO:

• remove password fields;
• checks registration with empty password;
• fix missing "reset password" validate bug -- it's don't validate it by validatePassword proc;

[kodemonster]

Are we removing both password fields.

[JayDi85]

@kodemonster yes, register dialog don't need both password fields at all (password is auto-generated by server). But client must sent empty password to server as register method calls (for backward compatibility with old versions).