All of the theme strings are translatable and are therefore compatible with multilanguage plugins.
This is why the theme is compatible with WPML, one of the most famous plugin for managing a multilingual website in wordpress.
To purchase the plugin you can go here for any problem you can rely on its official support here.
Note : For the proper management of your multilingual site you must also translate the plugin strings nd-shortcodes.
Introduction to translations files with wordpress. Learn more about .mo .po and .pot file