To clarify the information on the Community thread. You can get a verification badge next to your English language. In order to do it, feel free to follow these steps:
You can do that by taking the new English Certification Test, by Duolingo. You will be taking the test on Duolingo, but can post the results on Upwork! Here are instructions to take the test:
Go to http://testcenter.duolingo.com.
Take the English certification test. It'll take 20 minutes, and will incur a cost of $49. You'll need a valid photo ID and a webcam. It's available in Android, iOS and Chrome desktop.
After taking the test, you can add it to your profile by clicking Share Certificate > Upwork.
Once done, you'll see a "Certification Badge" on your profile and your English language proficiency will be marked "verified."