Hello,
Unfortunately I'm not a native US speaker since I was born and raised in the Netherlands. However, my english skills are near-native I would say. I noticed that you have a test for the translating work, so I would suggest that I take the test in order to prove my worth and hopefully you will see me as an eligible candidate for the job. I am currently in between jobs, therefor I will be available practically 7 days a week. I hope you might still consider me as a decent candidate despite the fact that I am not an actual native speaker from the US or UK.
As a side note:
I found two other projects of yours, one for UK English and one for French. Instead of applying three times I figured it would be easier to include my French knowledge in this application.