Translation bug?

Not really sure this is the right forum, but here goes…

I’m in the process of translating 2.1. Actually I’m done, but there is a flaw. On the dashboard, the headers look like

WordPress 2.1 Ella — 3 days ago

Before upgrading, with the translation file in place, it looked correct, like this:

WordPress 2.1 Ella — 3 dage siden

After upgrading to 2.1 and translating, it now says

WordPress 2.1 Ella — 3 days siden

I checked my entire translation file for all occurrences of “days” and “day”, and they are all translated. Did you forget to make it “translateable?” (Is that even a proper word?)