I was wonder how we can see the programming language in the contest. Because I using Javascript for the contest. So it is really hard to find someone who also use Javascript for contest to refer. That's why I tried to look around and I found this post
https://leetcode.com/discuss/general-discussion/201517/(SCRIPT-TOOL)-Leetcode-contest-language-picker
There is some issues with current script. We could not see the user data from China. And also the displaying data issue.
I fixed it and raised a PR to the main repo.
https://github.com/rupeshdabbir/leetcode-language-picker/pull/7
This is how it looks now

Check this out (main repo):
https://github.com/rupeshdabbir/leetcode-language-picker/
Installation (If you have tampermonkey): my update version
https://greasyfork.org/en/scripts/406320-leetcode-contest-language-revealer
How-to: