It's possible to change the names, and it might be affected by the language you've got set as well (For those who may not know, the English word is "colour" and the American-English variation is "color"). Can't say I've noticed it, but a quick look across the instances I've got shows consistency.
The obvious question is which versions of Jira Agile / Greenhopper are you using, and what are your language settings?
I don't know for sure the version of Greenhopper that the one instance started with. But it has only been a couple of months back. Now installing Jira Agile in a new instance does it have the new spelling. As far as the language settings, I looked and looked and all that I can find are set the same.
Agile Project Management for JIRA (Build: #1d66b3c2c376+) or 6.3.1
Ok, you should be able to check the plugin version and default language by looking at the "system information" page under admin. (I'd use search in the browser - the page can be very long and techy)
You also should check what language you have set in your profile.
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