where to find Ubercart translation files

I am trying to update language specific text files ("po files") for Ubercart, but it is unclear who/where these files are maintained. There are several places sited but I am not sure which is maintained?

http://ftp.drupal.org/files/translations/6.x/ubercart/

http://l10n.privnet.biz/translation_group/

Also a description of how to do this in Drupal. In Drupal (link: admin/build/translate/import) 开发者_JS百科there are several text groups to select. Do I have to repeat update for each group?

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you need only to do it once. i usually get translations from localize.drupal.org but you will need to register there.