Auto-translated
credits.txt - for the heroes in general.
zredits.txt - for "In the Wake of Gods".
They are both located in h3bitmap.lod.
I don't know how you were looking for them... it's an obvious file name in the main resource file...
As for the map editor, the question remains unanswered... what are your needs?
Инфа о разных моих проектах, по большей части геройских, тут http://phomm.narod.ru