我最终不得不手动检测这种语言，下面是我如何解决它的：

<?php if (ICL_LANGUAGE_CODE == \'fr\')
        {  
        // display the menu en francais 
            wp_nav_menu( array( \'menu\' => \'Navigation principale\', \'theme_location\' => \'primary\', \'container_class\' => \'menu-header\', \'menu_id\' => \'menu-primary-navigation\' ) );       
        } 
        else {  
        // show them the menu in English
            wp_nav_menu( array( \'menu\' => \'Primary Navigation\', \'theme_location\' => \'primary\', \'container_class\' => \'menu-header\', \'menu_id\' => \'menu-primary-navigation\' ) );
        }; ?>