You'd have to switch your machine's system locale to English, Control Panel + Language.
That's a rather impactful change since it also changes the locale for every other program on your machine. One thing you can try (but I cannot verify) is to whack the localization file that the C# compiler uses for strings. On your machine it should be located in c:windowsmicrosoft.netframeworkv4.0.303191036cscui.dll. Rename the file so the C# compiler can't find it and is forced to fallback to, hopefully, English. Btw, I guessed at 1036, there are lots of French locales. Locale IDs are listed here.
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