下面是您需要添加到主题函数文件中的代码。

// Replace Posts label as Articles in Admin Panel 

function change_post_menu_label() {
    global $menu;
    global $submenu;
    $menu[5][0] = 'Articles';
    $submenu['edit.php'][5][0] = 'Articles';
    $submenu['edit.php'][10][0] = 'Add Articles';
    echo '';
}
function change_post_object_label() {
        global $wp_post_types;
        $labels = &$wp_post_types['post']->labels;
        $labels->name = 'Articles';
        $labels->singular_name = 'Article';
        $labels->add_new = 'Add Article';
        $labels->add_new_item = 'Add Article';
        $labels->edit_item = 'Edit Article';
        $labels->new_item = 'Article';
        $labels->view_item = 'View Article';
        $labels->search_items = 'Search Articles';
        $labels->not_found = 'No Articles found';
        $labels->not_found_in_trash = 'No Articles found in Trash';
        $labels->name_admin_bar = 'Add Article';'
}
add_action( 'init', 'change_post_object_label' );
add_action( 'admin_menu', 'change_post_menu_label' );

改编自：https://wordpress.stackexchange.com/questions/9211/changing-admin-menu-labels

我可以使用post_type_labels_{$post_type}过滤器解决这个问题，如下所示

add_filter( 'post_type_labels_post', 'change_post_labels' );

function change_post_labels( $args ) {
        foreach( $args as $key => $label ){
            $args->{$key} = str_replace( [ __( 'Posts' ), __( 'Post' ) ], __( 'News' ), $label );
        }

        return $args;
}

这个答案还保留了完整的翻译支持。
唯一需要注意的是，您必须在init操作触发之前添加过滤器。

在主题函数文件中包含以下行：

//Change Posts labels in sidebar admin menu
  function custom_post_menu_label() {
     global $menu;
     global $submenu;
     $menu[5][0] = 'News';
     $submenu['edit.php'][5][0] = 'News';
     $submenu['edit.php'][10][0] = 'Add News';         
  }

 //Change Posts labels in other admin area
  function custom_post_object_label() {
    global $wp_post_types;
    $labels = &$wp_post_types['post']->labels;
    $labels->name = 'News';
    $labels->singular_name = 'News';
    $labels->add_new = 'Add News';
    $labels->add_new_item = 'Add News';
    $labels->edit_item = 'Edit News';
    $labels->new_item = 'News';
    $labels->view_item = 'View News';
    $labels->search_items = 'Search News';
    $labels->not_found = 'No results on News';
    $labels->not_found_in_trash = 'No News in Trash';
    $labels->name_admin_bar = 'Add News';       

   }

 add_action( 'init', 'custom_post_object_label' );
 add_action( 'admin_menu', 'custom_post_menu_label' );

上一个答案的作者忘记包括'$labels-〉name_admin_bar = '添加新闻';'字符串。