How can I rename the Administrator Panel Post ?

How can I hook or whatever I need to perform this edit without hacking root files?

Create a wp-content/mu-plugins folder for “must use” plugins that are always active and drop the following into a php file in your mu-plugins folder:

<?php
function ds_posts_menu_renamed() {
global $menu;
	unset($menu[5]);
	$menu[5] = array( __('Blog Posts'), 'edit_posts', 'edit.php', '', 'open-if-no-js menu-top menu-icon-post', 'menu-posts', 'div' );
}
add_action('_admin_menu','ds_posts_menu_renamed');
?>

Not sure how an upgrade would fare.

Any edits to core files will be overwritten during any upgrade.

But simple is best. I refuse to install a plug just to do this.

The contents of the folder mu-plugins folder are not overwritten during a one-click upgrade. “mu-plugins” is the place for little snips you want loaded as if there were part of the core files, but not necessarily a full-fledged plugin.

@david Sader

$menu[5] = array( __('Blog Posts'), 'edit_posts', 'edit.php', '', 'open-if-no-js menu-top menu-icon-post', 'menu-posts', 'div' );

Thanks for the tips! Just wondering but could you tell us what the parameters in the code above represent, please? Cheers!