On trac, add "+1" column header to all ticket tables, not just the first one on the page.

[Wizek]

Example url: https://ghc.haskell.org/trac/ghc/query?status=new&status=assigned&status=reopened&group=milestone&order=priority

Example picture pointing to the headers: https://www.screencast.com/t/sQAqL3YQSjDK

I suspect this may be rather easy to fix, just changing a ~ .querySelector() to a ~ .querySelectorAll() and looping over the results.

If I would submit a pull request for this, would you be willing to merge it?
Also, if yes, might you be willing to point me towards the relevant code section?