Fileld translation (module Internationalization)

Hi,

I have problem. I use Internationalization module but I can't translate main field "Basic page" into polish in "node/add".

When I try to do it in translate it in admin/config/regional/translate/translate I have "Tekst w oryginale" (orginal text in English) Basic page. I can't edit this field :( Can I do it in drupal php file? Where can I find it. I have installed a new polish translation but any success? Do you have any idea how I can solve my problem? Almost all fields are translated in polish but "Basic Page" or "Title *" not. I have default language polish