How do I add a new culture?

[unmerged(136873)]

I modified some files and I have added the etruscan people playable: a new faction in Etruria. Unfortunetly I don't succeeded to add a new etruscan culture in the cultures.avs and cultures.txt files. I modified these files adding new male, female and family names that other cultures, but the game jams during the loading...
Could someone help me?

 

[Sute]{h]

Register your game and post in the mod section.

A mod has already been made introducing the changes you want.