Issues translating CCK, Quicktabs - wrong language



Hi!

My site was build in English, now we installed support for Polish language and disabled English. I have issues translating strings from CCK and Quick Tabs category using build-in Drupal translator (/admin/build/translate).

When I translate a string from Standard Interface category, translator shows me the original text and a field to input POLISH translation - it's correct.
But when I try to translate anything from CCK or Quick Tabs, there's original text and ENGLISH translation field.

Any ideas why such behavior or how to fix it?