The7 is a highly customizable, multipurpose theme that comes bundled with WPBakery Page Builder (former Visual Composer), and two slider plugins, LayerSlider and Slider Revolution. WPML is compatible with all of them. You only need to build your pages once and then use WPML to translate the text they feature. You can also easily translate your sliders, as well as categories, menus, and the texts coming from the theme itself.
Here you will find WPML contractors who can help you build multilingual sites based on the7 and WPML. Use the search to find contractors who are right for your project and send them a message to get started.