Clarify who determines whether to accept a contribution

> **We determine the code that is in our project**. You understand that the decision to include the Contribution in any project or source repository is entirely that of the Open Knowledge Foundation, and this agreement does not guarantee that the Contributions will be included in any product.

If this means, "the decision to accept a patch, fix or new feature" I guess that it is up to the technical dev team, commiters or whatever is called, not the Open Knowledge Foundation