[Wordpress] show custom columns in manager category

/**
 * Show column name kana
 */
if ( ! function_exists( 'kana_cpt_columns' ) ) {
    function kana_cpt_columns( $columns ) {
        if ( !isset($_GET['taxonomy']) || $_GET['taxonomy'] != 'category' )
        return $columns;
        $columns["namekana"] = "Name Kana";
        return $columns;
    }
    add_filter('manage_edit-category_columns', 'kana_cpt_columns');
}
function manage_category_custom_fields($deprecated,$column_name,$term_id) {
    if ($column_name == 'namekana') {
        echo 'test';
    }
}
add_action('manage_category_custom_column','manage_category_custom_fields',10,3);