Some words (Days of the week, Months of the year, Keyboard key names) I get directly from Windows. Unfortunately because I have no idea what language these are in I do not try to translate them.
Consider an example: On the German version of Windows the 'Delete' key is called 'Entfernen'. If I try to translate this I will be looking for the German word as if it was English and I will not find it.
I accept that I could try to detect if the user is running an English version of Windows and only translate in that case, but this is a complication I don't want just at the moment. However I will think about it further.