Date refuses to switch locale

Hi,

after upgrading from D5 to D6 I became unable to set date strings to properly localized values; all dates, e.g. in Views, are in English (I'd like to choose German). I did the upgrade by disabling all contributed modules, upgraded core, then enabled CCK, then the other contributed modules, including date; between each of these steps I ran update.php. Currently enabled from Date 6.x-2.2 are the following sub-modules: Date, Date API, Date Locale, Date Popup, and Date Timezone.

When going to ./admin/settings/date-time/locale, I get a pulldown menu with the items "English" and "German"; when I choose "German", I get a 2nd screen with setting for the CCK date fields; saving these returns me to ./admin/settings/date-time/locale, where still "English is selected. ate strings are still not translated. Disabling "Date Locale" sub-module, running update.php, enabling it, and running update.php does not resolve the problem. The last thing I could think of was to import the German .po package through ./admin/build/translate/import again, but also without success.

Is this behaviour to be expected? Any ideas or suggestions what is going wrong here or what I am doing wrong? And how to properly localize the date strings (e.g. weekdays)?

Thanks & greetings, -asb