You will also need to add the following to your config_inc.php file. This allows these global variables to be back-added to the config_defaults_inc.php file in a future release of Mantis.

TIP: I keep a list of any custom edited files in my config_inc.php file so that when I upgrade to a new release I can make sure to preserve my modifications.

CUSTOM GLOBAL VARIABLES TO UNBRAND MANTIS

$g_application_homepage = 'http://your.domain.com/'; //e.g. http://bugs.mantisbt.org
$g_application_title = 'Your Company Name Bug Tracker'; //e.g. Mantis Bug Tracker
$g_application_logo = 'images/your_logo.jpg'; //This is the header logo, rename and point to the correct location
$g_company_name = 'Company Name'; //e.g. Mantis
$g_company_homepage = 'http://www.domain.com/'; //e.g. http://www.mantisbt.org
$g_powered_by_logo = 'images/powered_by.gif'; //This is the footer logo, rename and point to the correct location

EDITED FILES TO REFERENCE CUSTOM GLOBAL VARIABLES FROM ABOVE:

./core.php

./core/html_api.php

./core/php_api.php

./lang/strings_english.txt