locale language files dont get rebuild and they keep generating page not found errors.
Here is a fix to rebuild the lost translation files.

a little module for D6 which
Provides locale admin pages with buttons to rebuild/invalidate js translations.

- enable the module
- navigate to admin/settings/language#js-translations
- expand "JavaScript translations" fieldset
- use either "Invalidate js translations" or "Rebuild js translations" buttons

http://drupal.org/files/issues/2009-09-12%20tweak_locale_js_0.zip [3]

(module provided by arhak [4])