Problems with localization

I just tried to change language of my WP install to Swedish. However, it didn’t quite work. I followed the steps as instructed in the appropriate guide. However, the only difference I noticed on the publically visible pages were that the dates changed to Swedish, even though it seems as if the admin panel changed completely.

I’m running version 2.0.3, and the .mo file was marked as version 2.0. I suspect that changes were made between those versions that made the file I’m currently using incompatible. Is this the case, and if so, is there an easy fix, save translating the whole thing myself?