Thread:Extension talk:MessageCommons/All messages

I have MessageCommons in place on a farm and working, I have been deleting messages as seen fit on the outlying wikis so far, my question is, are there any messages that will not be handled by the extension ? ie. Gadgets, bad/title/black/white lists and .CSS/.js. My guess is the extension searches the common database and the local wiki and uses any modified version of the needed message first and then the local unmodified version, and this would happen no matter the nature of the message being sought.