These strings are inserted into the database at install time. Unless you have these translations imported before the system.install script runs (which is not possible, even if you use the autolocale module and localized profile which imports at the earliest possible). The system.module is forced to be the first to be installed so it is not possible yet to release an install profile, which does anything before the system module install script is run. So we cannot help these English strings there.
I am open to solutions :)
Which is a critical bug obviously, am i wrong? But i fairly don't understand. These strings are not regular strings available to Drupal?
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Jakub