DVD regional settings apply to movies, not to software.
Besides, the add-on is on a CD, not a DVD.
I have the original SH4 in English, bought from an UK shop. I purchased the "Flemish" (Dutch speaking) box of the add-on, supposedly with game in English.
Indeed, there are 3 national languages in Belgium (but only 2 really represented in Brussels, regarding merchandises for which language matters), and I wanted the same language for the add-on as with the original SH4.
My Windows XP has French speaking regional settings, and the U-boat Missions add-on got installed in... French!
So, from this, I suppose that several languages are actually on the CD, and the one corresponding to your OS will be installed. Just a guess, I'm not sure, of course.
What I can say is that I was not asked to select a language.
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