There are many text strings in the game that are held over from GalCiv1 (I remember seeing them before). They contain specific references to "humans" or "Earth", but still come up regardless of what race you are playing.

examples:
(first new colony message): "After being trapped on Earth for thousands of years..."
(colonization random event): "...strange, oceanic creatures over 5 times the length of the average human..."

I recommend one of two ways to fix this:
Search all the strings in the data files and replace references to "humans", "Earth", etc., with more race-general comments
OR
Add hooks to the game engine that will pick a different string based on what race you are playing. Put placeholders in for now (example: --enter Drengin first new colony text here---) and fill them in with proper text later on.