doitinpoland.com/wp-content/plugins/sitepress-multilingual-cms/res/js/translation-synchronization.js

/*globals iclSaveForm*/
jQuery(function () {
    jQuery('#icl_page_sync_options').submit(iclSaveForm);
    jQuery('form[name="icl_custom_tax_sync_options"]').submit(iclSaveForm);
    jQuery('form[name="icl_custom_posts_sync_options"]').submit(iclSaveForm);
});