The bug

The category containing the producer Marc Watson under Mojang is titled Associate Producers, and is incorrectly pluralized, as there is only one producer with that title.

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

Associate Producers
   Marc Watson

Fix

The title should be Associate Producer to be consistent with other titles that contain only one person.

Associate Producer
   Marc Watson

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