I use Rey Theme and WooCommerce. Generally I don't have any problem with the localization of the theme and plugin, in fact I have translated all strings wanted in both, but I have an issue in the checkout page. All strings are properly translated but they won't all show up in front, just few - I imagine there's a conflict between Rey Theme and WooCommerce common strings? All other strings are translated without any problem like in cart for example. (see attachments)
Thank you for contacting WPML support. While you are waiting for one of my colleagues to take this ticket and work on it, let me provide you with the first debugging steps and try to help with the issue quickly.
Please update all WPML plugins to the latest version (4.6.10) by going to the Plugins → Add New page, click the Commercial tab, and then click Check for updates.