Uh, the company is originally Danish and I believe most of the staff are still in fact Danes. Her grammar was poor but understandable. I'm not sure why this guy gets so rage-filled when the email is innocuous when read coming from the mouth of a non-native speaker of English. Calling a response to any sort of support mail a "ticket" is pretty common as well and certainly not worthy of offense.
Then again, I don't run a business, so the costs of localizing customer support and "fit and finish" for Zendesk may be justified by the benefit.