The X Theme includes the Cornerstone page builder and both are compatible with WPML. You need to design your pages once and translate only the featured texts using WPML. Besides Cornerstone elements, you can translate the Portfolio pages as well as the texts coming from the X Theme.
Here you will find WPML contractors who can help you build multilingual sites based on x and WPML. Use the search to find contractors who are right for your project and send them a message to get started.