To change the language in the plugin, you will have to change the language in your entire site, because the plugin uses whatever language translation file you have set up in your WooCommerce store e.g. if the site is in German, the plugin uses the German tranlation file along with the rest of the site.
You may need to translate to your desired language because we do not have translation files for some of the languages yet.
Our plugin is compatible with any of these translation plugins: WPML, Loco Translate, or Codestyling.