There's also CIV4TraitInfos.xml in warlords folder. I'd suggest you using that because I'm sure BTS does so too. I'm not sure what is the difference between them but I suggest you to use the most recent files to your version you're modding.
If you mod civiv, use its files. If you mod warlords, use its files OR if there isn't the file your looking for, use civiv's file. If you mod BTS, use its files OR if there isn't the file your looking for, use warlords' file and again if there isn't the file your looking for, use civiv's file.
That's basicly how it goes. If I didn't miss anything.