Betheme offers a wide palette of features and includes the Muffin Builder. WPML is compatible with both. This means you build your pages with Muffin Builder once and then translate only the texts they contain. Additionally, you can translate the Portfolio pages, custom taxonomies, widgets, and all the texts coming from Betheme itself.
Here you will find WPML contractors who can help you build multilingual sites based on betheme and WPML. Use the search to find contractors who are right for your project and send them a message to get started.