User password widget modified.

Currently the user password is shown as follows in the details page:
    Password: Reset Password

This is inconsistent with the rest of the page because the 'Reset Password' is an action, not the value of the password.

Now password is shown as follows:
    Password: *******   (if set)
    Password:           (if not set)

Reset password link was removed as well the dialog for reset password was removed from password widget. The dialog was moved to its own object and can be now showed independently. An action for showing this dialog should be created.

https://fedorahosted.org/freeipa/ticket/2248

ipalib/plugins/internal.py

@@ -564,6 +564,7 @@ class i18n_messages(Command):
             "current_password": _("Current Password"),
             "current_password_required": _("Current password is required"),
             "new_password": _("New Password"),
+            "new_password_required": _("New password is required"),
             "password_change_complete": _("Password change complete"),
             "password_must_match": _("Passwords must match"),
             "reset_password": _("Reset Password"),