Hi Tim,
If so, you may want to install the kde-i18n-de-kde3 package
this one is installed as well as some others which are apparently not connected with kde3. E.g. If I right-click on the desktop, and choose the last item "Abmelden/logout(?)", the next window appears in english. If I click on the K-button, mearly everything is in english.
Did you upgrade this system from an earlier version of Trinity (e.g. 3.5.11), or is it a brand new installation?