Wordpress - Customize Backoffice footer messages

wp_backoffice_foot_msg.php

<?php

// Remove or Replace the Update WP footer link
add_filter('update_footer', remove_admin_footer_upgrade, 1000);
function remove_admin_footer_upgrade($footer_text =''){
    return 'your message';
}

// Remove or Replace the Powered By text
add_filter('admin_footer_text', 'remove_footer_admin');
function remove_footer_admin () {
	$link = "http://www.yourcompanysite.pt/";
	echo "Website developed by <a href=\"$link\" target=\"_blank\">YourCompany</a>";
}

?>