Rename My Account to Login Username

In Drupal 7, after user login then the user menu "My Account" and "Logout" links appear at the right corner.  This would be better if  I can change the link "My Account" to the login username.


This is the default:

And this is what I want:

STEP 1: Open user.module file
The user.module file can be found in folder /modules/user

STEP 2: Change the code
from:

function user_menu_title() {
  return user_is_logged_in() ? t('My Account') : t('User account');
}

to:
function user_menu_title() {
  return user_is_logged_in() ? $GLOBALS['user']->name : t('User account');
}

another method can be found here: