I got a few replies from people who had trouble getting it to run. This is good feedback, I guess the install instructions weren't crystal clear and I'll update them tomorrow. I had only shared this with my colleagues at Altanova and I've always guided them in real time.
the simplest is to use both files in there:
https://github.com/jmarrec/notepad/tree/master/EnergyPlus%20OnlyYou'll have to rename them to just functionList.xml and userDefineLang.xml before placing them into your %appdata%Notepad++ folder.
The reason I have them with different names is because I wanted to avoid people simply overwriting their local files without thinking about it, and maybe regret it later. I recommend keeping a copy of the original files (you can even leave them in the same folder by renaming to functionList-ori.xml for example)