RTC Eclipse Client, Editor Presentation Label

My user wants to re-label the "Time Spent" (type = Duration) label on the "Task" workitem to be "Duration" instead of "Time Spent".
I am editing the associated Work Item Editor - Editor Presentation
On the Overview tab, I highlight the "Time Spent (Time Spent) field and click Edit. I add a "Label (optional)" of "Duration".
This works perfectly in the Web client, however in the Eclipse client it still displays as "Time Spent". How do I get it to display as "Duration" in the Eclipse client as well?

I can't rename the "Time Spent" attribute as it will then be changed on other work item types (which I don't want).