[tbb-bugs] #30657 [Applications/Tor Browser]: Tor Browser locale is leaked via title of link tag on 404 error page

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#30657: Tor Browser locale is leaked via title of link tag on 404 error page
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     Reporter:  gk                   |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  High                 |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-fingerprinting-
     Severity:  Normal               |  locale
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 ryotak reported via our HackerOne bug bounty program that the Tor Browser
 locale is leaked via the title of link tag on 404 error page.

 For a test ryotak came up with see:
 https://people.torproject.org/~gk/tests/tor_plaintext_locale_leak.html.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30657>
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