We have the same problem at
www.fairlay.com. We do not have a native english speaker in our team. (we are from Germany and Brazil)
I think the static texts on our page are all reviewed by native speaker and should be finde. However, we have to set up new prediction descriptions every day. Often we try to react very fast on recent events to come up with a good prediction on them. This is the way how broken english makes it on our page.
I would love to have an automated service where you can send text to (1-5 sentences) - to get it reviewed and pay a small amount in Bitcoin for it. We would use that instantly!