The "fi" locale is missing from KDE_LINGUAS in Amarok-2.1.ebuild.
Is is in 2.0.2, and this localization exists (although lacks a bit behind).
Please add it to the next ebuild.
Application is in English.
Application should be Finnish.
We package exactly what upstream releases.
They dropped fi translation because it was too uncomplete.
So we really cant fix.
Open bug on bugs.kde.org if you really think it is bug, but i would better suggest rather contributing to the named translation yourself.
Upstream will gladly accept it and use for next release.
Version 2.1.1 now again has the fi localization. Please make sure to update the flags for that release. :)