Impreza comes with the Slider Revolution and WPBakery Page Builder (former Visual Composer) plugins. The theme and the plugins are all compatible with WPML. You need to build your pages once and then just translate the featured texts. You can also translate your sliders, Portfolio pages, categories, and all the texts coming from the theme itself.
Here you will find WPML contractors who can help you build multilingual sites based on impreza and WPML. Use the search to find contractors who are right for your project and send them a message to get started.