What determines an Xcode Project's developmentRegion setting?

I'm working on a C++ project using Xcode with another developer. Every time he opens the xcodeproj, his version of Xcode adds developmentRegion = English; to the project.pbxproj file inside the xcodeproj. Every time I open the xcodeproj, my version of Xcode removes the developmentRegion = English; line from the project.pbxproj file.

We have the xcode project committed to source control, and the cons开发者_开发问答tant back and forth of this line is quite annoying. How can I configure my system so that Xcode doesn't try to remove the line? Or, alternatively, how can he configure his system so that Xcode doesn't try to add the line?

Thanks!

---

I think it's related to your Xcode version, version 3.2.4 started adding that string, while previous versions don't (and are are removing it).