[tor-bugs] #12967 [Tor Launcher]: Support a multi-lingual TBB that can switch between localizations

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#12967: Support a multi-lingual TBB that can switch between localizations
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     Reporter:           |      Owner:  mcs
  mikeperry              |     Status:  assigned
         Type:           |  Milestone:
  enhancement            |    Version:
     Priority:  major    |   Keywords:  tbb-usability-stopppoint-wizard,
    Component:  Tor      |  TorBrowserTeam201510
  Launcher               |  Parent ID:
   Resolution:           |    Sponsor:  SponsorU
Actual Points:           |
       Points:           |
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Comment (by mcs):

 Replying to [comment:14 anonym]:
 > From Tails side, users will pick a locale when starting Tails, so we
 need a way to not show the locale picker and instead use the system
 locale. I assume that all we have to do is set some first-run pref to not
 show it, and then set `general.useragent.locale` properly (or
 `intl.locale.matchOS`?) and then we'll have the same result as if the user
 used your locale picker. Am I correct?

 Yes. We plan to support a TOR_SKIP_LOCALE_PROMPT env variable as well as a
 hidden pref. Our plan is for Tor Browser to have (via Tor Launcher)
 intl.locale.matchOS = true. When the user answers the locale prompt, the
 Tor Launcher code will reset intl.locale.matchOS to false and also set
 general.useragent.locale to the locale that was chosen.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12967#comment:15>
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