对于任何有相同问题的人，我现在使用的是以下问题的公认答案中的解决方法：https://wordpress.stackexchange.com/a/30723/181214

我使用的解决方案超出了；编辑：另一个选项；这对鼻涕虫、名字、单数名字等都适用。

function get_labels() {
    // return a default slug
    if(!defined(\'WPLANG\') || !WPLANG || \'de_DE\' == WPLANG) return array(\'slug\' => \'produkt\', \'name\' => \'Produkte\', \'singular_name\' => \'Produkt\');

    $slugs = array(
        \'en_US\' => array(\'slug\' => \'product\', \'name\' => \'Products\', \'singular_name\' => \'Product\'),
        \'en_UK\' => array(\'slug\' => \'product\', \'name\' => \'Products\', \'singular_name\' => \'Product\'),
        \'de_DE\' => array(\'slug\' => \'produkt\', \'name\' => \'Produkte\', \'singular_name\' => \'Produkt\'),
        \'de_CH\' => array(\'slug\' => \'produkt\', \'name\' => \'Produkte\', \'singular_name\' => \'Produkt\'),
        \'fr_FR\' => array(\'slug\' => \'produit\', \'name\' => \'Produits\', \'singular_name\' => \'Produit\'),
        \'es_ES\' => array(\'slug\' => \'producto\', \'name\' => \'Productos\', \'singular_name\' => \'Producto\')
    );

    return $slugs[WPLANG];
}

function product() {
    $labels = get_labels();

    register_post_type(\'product\',
        array(
            \'labels\'      => array(
                \'name\'          => $labels[\'name\'],
                \'singular_name\' => $labels[\'singular_name\'],
            ),
            \'public\'      => true,
            \'has_archive\' => true,
            \'show_ui\' => true,
            \'rewrite\' => array(
                \'slug\' => $labels[\'slug\']
            ),
            \'show_in_menu\' => true,
            \'supports\' => array(
                \'title\',
                \'post-thumbnail\',
            )
        )
    );
}
add_action(\'init\', \'product\');