[tor-bugs] #21784 [Applications/Tor Browser]: Check `toLocaleString()` methods for locale leaks

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#21784: Check `toLocaleString()` methods for locale leaks
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  task                                 |         Status:
                                                 |  needs_review
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ff52-esr, tbb-fingerprinting,        |  Actual Points:
  tbb-7.0-must-alpha TorBrowserTeam201705R       |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by arthuredelstein):

 * status:  needs_information => needs_review
 * keywords:  ff52-esr, tbb-fingerprinting, tbb-7.0-must-alpha => ff52-esr,
     tbb-fingerprinting, tbb-7.0-must-alpha TorBrowserTeam201705R


Comment:

 Replying to [comment:5 arthuredelstein]:

 > In order to test this, we could write a simple xpcshell test, but we
 need to set the environment variable `LANG` before running it. I couldn't
 find any way to do this in the standard Mozilla testing framework.
 Nicolas, is this something we could do in your tor-browser-bundle-
 testsuite?

 I opened #22125 to handle such a test. Requesting a review to confirm the
 results of the manual test.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21784#comment:6>
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