#2: dashboard_primary_title

dashboard_primary_title.php

<?php
/**
 * NOTE: This one is on hold until we can confirm
 * it actually a) works, b) serves a purpose.
 * 
 * Filter the WordPress Blog widget title
 * 
 * @see wp_dashboard_setup()
 * 
 * @param string $title The dashboard widget title.
 * @return string The filtered widget title.
 */
function filter_wp_blog_widget_title( $title ) {
  return __( 'Awesome WordPress Blog', 'yourtextdomain' );
}
add_filter( 'dashboard_primary_title', 'filter_wp_blog_widget_title' );