Rob,
I have been in contact with the iTunes Store (iTunesStoreSupport@apple.com) and got the following response.... Maybe if we all call the phone number that they may do something about it, although I doubt it. I think that Apple lost the ability to listen to their customers.
Regards
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I'm so sorry to hear that the language issue is getting worse and you
haven't been able to change anything back to English. This must be
extremely frustrating.
Although your request for assistance has reached iTunes Store support
which answers non-technical questions, exclusively about billing, I'll
do my best to find some helpful information for you.
I have tried searching to see if there are any other ways to change
the language, but I just keep getting the same article that I sent you
previously.
Here is an article I found in Apple's knowledge base for you:
iTunes: Changing the display language
http://support.apple.com/kb/HT2242
Because the steps in this article don't seem to be working for you, I
recommend that you contact technical support at (31) 0900 7777 703.
There may be a setting on your computer that is blocking the change.
Also, a wide variety of helpful tutorials, troubleshooting tips, and
support information can be found on the iTunes support website:
http://www.apple.com/support/itunes/ww
Or, to post questions and read answers provided by other iTunes users,
who my be experiencing the same issue, you can participate in iTunes
discussions at our Discussions forum:
http://discussions.apple.com/category.jspa?categoryID=149
Sorry I couldn't have been more help. Take care.
Sincerely,
iTunes Store Customer Support