Exception messages in English

Exception messages should be sent in English language rather than on
user language.

The example of Culture impact to exception:

Russian locale:

System.IO.FileNotFoundException: Some message
__Имя файла__: 'test.zip'
   __в__ NBug.Examples.WinForms.MainForm.CrashButton_Click(Object sender, EventArgs e) в MainForm.cs:__строка__ 54
   __в__ System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
...

InvariantCulture:

System.IO.FileNotFoundException: Some message
__File name__: 'test.zip'
   __at__ NBug.Examples.WinForms.MainForm.CrashButton_Click(Object sender, EventArgs e) in MainForm.cs:__line__ 54
   __at__ System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
...


Git shows diff incorrectly. Real change is simple:

            var oldCulture = Thread.CurrentThread.CurrentCulture;
            var oldUICulture = Thread.CurrentThread.CurrentUICulture;
            try
            {
                // Prefer messages in English, instead of in language of the user.
                Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
                Thread.CurrentThread.CurrentUICulture = CultureInfo.InvariantCulture;

               ... Old code ...
            }
            finally
            {
                Thread.CurrentThread.CurrentCulture = oldCulture;
                Thread.CurrentThread.CurrentUICulture = oldUICulture;
            }