It may be useful to someone.
This module dont work... the payment, shipping and cart dont appear, just loading for eternit.
The solution was very simple. We need to add "." in
/modules/thecheckout/views/templates/front/front.tpl
this
var i18_requiredField = "{l s='Required field' d='Shop.Forms.Errors'}";
change to
var i18_requiredField = "{l s='Required field.' d='Shop.Forms.Errors'}";