basque (eu) windows installer translation

Hi,

I realized that I can already choose the install language in windows,
so I translated "\2.6.8\src\pkg\win\setup\NSISv2\lang\English.nsh".

Anyway, there are some strings that I can't get to see anywhere (for
translation, I mean).
In the win installer, the first window:
-"Installer Language"
-"Please select a language"
-the language-list
-"OK", "Cancel"

And in the next window:
-"Welcome to the Abiword 2.6.8 Setup Wizard"
-etc etc

And more, and more

I guess that I should translate some other files.
Which ones?