taxonomy field intro-de

add_action( 'intro_edit_form_fields', "intro_add_term_field");

function intro_add_term_field( $term ){
   $intro = get_term_meta( $term->term_id, 'intro_de', true );
    echo '<tr class="form-field">
      <th scope="row"><label for="intro_de">Nome tedesco</label></th>
      <td><input type="text" name="intro_de" value="'.$intro.'"  />
      <p class="description">Nome del termine in tedesco</p></td>
    </tr>';
}

add_action( 'saved_intro', 'update_intro');
function update_intro ( $term_id ) {
  update_term_meta( $term_id, 'intro_de', sanitize_text_field ( $_POST['intro_de'] ) );

}