I am trying to change the main menu text in the mantis bug tracker like "Report Issue" to "New Project" how can i accomplish this?
I looked at custom_strings_inc.php
but I could not understand how to change the main menu text from there.
You will have to identify the correct lang variable name from the existing lang files (in lang folder) and override them in custom_strings.
For example, if you want to change Report Issue to New Project, edit custom_strings_inc.php and add the following line:
$s_report_bug_link = "New Project";