The bug

The category containing the manager Isabella Balk under Mojang is titled Project Managers, and is incorrectly pluralized, as there is only one manager with that title.

Here is a part of the credits that demonstrates the bug:

Project Managers
   Isabella Balk

Fix

The title should be Project Manager to be consistent with other titles that contain only one person.

Project Manager
   Isabella Balk

I am going to attach a resource pack with the fix for this issue.