static function show_terms()
 {
     $taxonomy = isset($_POST['taxonomy']) ? $_POST['taxonomy'] : false;
     $args = array();
     if (!empty($_POST['language'])) {
         $args['languages'] = array($_POST['language']);
     }
     $args['status'] = isset($_POST['status']) ? $_POST['status'] : WPML_TT_TAXONOMIES_ALL;
     $args['search'] = isset($_POST['search']) ? $_POST['search'] : '';
     if (isset($_POST['page'])) {
         $args['page'] = $_POST['page'];
     }
     if (isset($_POST['parent'])) {
         $args['parent'] = $_POST['parent'];
     }
     if (isset($_POST['child_of']) && intval($_POST['child_of']) > 0) {
         $args['child_of'] = $_POST['child_of'];
     }
     $inst = new WPML_Taxonomy_Translation($taxonomy, $args);
     $inst->render();
     exit;
 }
<?php

$WPML_Translate_Taxonomy = new WPML_Taxonomy_Translation();
$WPML_Translate_Taxonomy->render();
 static function show_terms()
 {
     $taxonomy = isset($_POST['taxonomy']) ? $_POST['taxonomy'] : false;
     $args = array();
     if (!empty($_POST['language'])) {
         $args['languages'] = array($_POST['language']);
     }
     $args['status'] = isset($_POST['status']) ? $_POST['status'] : WPML_TT_TAXONOMIES_ALL;
     $args['search'] = isset($_POST['search']) ? $_POST['search'] : '';
     if (isset($_POST['page'])) {
         $args['page'] = $_POST['page'];
     }
     if (isset($_POST['parent'])) {
         $args['parent'] = $_POST['parent'];
     }
     if (isset($_POST['child_of']) && intval($_POST['child_of']) > 0) {
         $args['child_of'] = $_POST['child_of'];
     }
     $inst = new WPML_Taxonomy_Translation($taxonomy, $args);
     ob_start();
     $inst->render();
     $html = ob_get_contents();
     ob_end_clean();
     echo json_encode(array('html' => $html));
     exit;
 }