As of TFS 2008 SP1 the Team System Web Access (TSWA) SP1 supports multiple languages. And as expected that support covers the larger languages, to which unfortunatly Swedish didn't qualify as one.
I've had a couple of customers asking if it's possible to get TSWA in Swedish and so I looked around and found a project on Codeplex that aims to add additional localization support for TSWA, the Team System Web Access Translation Project managed by Marcel de Vries (Team System MVP). Apparently I've got too much free time so I decided to join in and contribute to the project with the Swedish translations. The project is getting closer to a v1 release and I'll get back with more details when it does.
Languages Currently in Development in this project:
Base Language already available from Microsoft for TSWA