Change default Post Type labels in Wordpress

gistfile1.txt

function frl_change_post_labels($post_type, $args){ /* change assigned labels */
    global $wp_post_types;
     
    if($post_type != 'post')
        return;
     
    $labels = new stdClass();
     
    $labels->name               = __('Articles', 'frl');
    $labels->singular_name      = __('Article', 'frl');
    $labels->add_new            = __('Add new', 'frl');
    $labels->add_new_item       = __('Add new Article', 'frl');
    $labels->edit_item          = __('Edit Article', 'frl');
    $labels->new_item           = __('New Article', 'frl');
    $labels->view_item          = __('View Article', 'frl');
    $labels->search_items       = __('Search Articles', 'frl');
    $labels->not_found          = __('No Articles found', 'frl');
    $labels->not_found_in_trash = __('No Articles found in Trash.', 'frl');
    $labels->parent_item_colon  = NULL;
    $labels->all_items          = __('All Articles', 'frl');
    $labels->menu_name          = __('Articles', 'frl');
    $labels->name_admin_bar     = __('Article', 'frl');
     
    $wp_post_types[$post_type]->labels = $labels;
}
add_action('registered_post_type', 'frl_change_post_labels', 2, 2);
 
function frl_change_post_menu_labels(){ /* change adming menu labels */
    global $menu, $submenu;
     
    $post_type_object = get_post_type_object('post');
    $sub_label = $post_type_object->labels->all_items; 
    $top_label = $post_type_object->labels->name;
     
    /* find proper top menu item */
    $post_menu_order = 0;
    foreach($menu as $order => $item){
         
        if($item[2] == 'edit.php'){
            $menu[$order][0] = $top_label;
            $post_menu_order = $order;
            break;
        }
    }
     
    /* find proper submenu */
    $submenu['edit.php'][$post_menu_order][0] = $sub_label;
}
add_action('admin_menu', 'frl_change_post_menu_labels');
 
function frl_change_post_updated_labels($messages){     /* change updated post labels */
    global $post;
         
    $permalink = get_permalink($post->ID);
         
    $messages['post'] = array(
         
    0 => '', 
    1 => sprintf( __('Article updated. <a href="%s">View post</a>', 'frl'), esc_url($permalink)),
    2 => __('Custom field updated.', 'frl'),
    3 => __('Custom field deleted.', 'frl'),
    4 => __('Article updated.', 'frl'),    
    5 => isset($_GET['revision']) ? sprintf(__('Article restored to revision from %s', 'frl'), wp_post_revision_title((int)$_GET['revision'], false)) : false,
    6 => sprintf( __('Article published. <a href="%s">View post</a>'), esc_url($permalink)),
    7 => __('Article saved.', 'frl'),
    8 => sprintf( __('Article submitted. <a target="_blank" href="%s">Preview</a>', 'frl'), esc_url(add_query_arg('preview','true', $permalink))),
    9 => __('Article scheduled. <a target="_blank" href="%2$s">Preview</a>', 'frl'),
    10 => sprintf( __('Article draft updated. <a target="_blank" href="%s">Preview</a>', 'frl'), esc_url(add_query_arg('preview', 'true', $permalink)))
 
    );
 
    return $messages;
}
add_filter('post_updated_messages', 'frl_change_post_updated_labels');