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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' );