Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Mods Publishing a Mod

If you're willing to do the search, you can find the UUIDs (or GUIDs) of talents etc. in the .exe, EoCapp.exe. At least for a couple of things, I found some of them and could look them up in the English.xml file.
Just search for the internal talent names in the .exe, the ones you can also find in Requirements.txt. (Like 'Raistlin' for 'Glass Cannon' etc.)

If you create your own names and want to localize them, you need to unpack the file where your object is saved, add a handle="..." to the name entry and put that handle into the English.xml or whatever language you use.