function _s_change_label() {
global $menu;
global $submenu;
$menu[5][0] = 'Blog Posts';
}
add_action( 'admin_menu', '_s_change_label' );
function _s_change_object() {
global $wp_post_types;
$labels = &$wp_post_types['post']->labels;
$labels->name = 'Blog Posts';
$labels->singular_name = 'Post';
$labels->menu_name = 'Posts';
$labels->name_admin_bar = 'Post';
$labels->add_new = 'Add New';
$labels->add_new_item = 'Add Post';
$labels->new_item = 'Post';
$labels->edit_item = 'Edit Posts';
$labels->view_item = 'View Post';
$labels->all_items = 'All Posts';
$labels->search_items = 'Search Posts';
$labels->not_found = 'No Posts found';
$labels->not_found_in_trash = 'No Posts found in Trash';
}
add_action( 'init', '_s_change_object' );