Force exceptions language in English

You could set the current culture to English only in debug builds :

#if DEBUG
Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-US");
#endif

For the good of all future users of your application, place this to the Main method:

CultureInfo.DefaultThreadCurrentUICulture = Thread.CurrentThread.CurrentUICulture = CultureInfo.InvariantCulture;

It will save them a good lot of trouble finding the English equivalent of a a badly translated error message.