I hope I can answer some DEV.

For fun I'm translating the game in my language (italy) by changing the text strings. Now my question is as follows:
Text strings contained in the XML files have a precise location numbers. Now if he draws a patch will also change the positions of the text within the xml file?
With various dlc or updates we will add new text file xml (to translate) or will change existing ones?

Thanks for the answers. If these files are not altered because it would be useless to continue the translation.