[Bug 1847772]

[L10n-mozilla]

No idea. There's two ways to get to a locale through the chrome reg:

- requested languages has that before en-US
- there's no en-US chrome package registered for `messenger`

How either of those two could happen for just a time-window on startup
..... no idea.

I also don't think that anything changed there recently.

To say something constructive, caching the folder names could be the
actual problem. I'd suggest to invalidate that caching on intl:app-
locales-changed, https://firefox-source-
docs.mozilla.org/intl/locale.html#events. Not sure if there's a smooth
way to make sure the UI updates.

Even longer-term, if you could make the display string of those folders
be Fluent and `data-l10n-id`, you shouldn't have these problems at all.

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https://bugs.launchpad.net/bugs/1847772

Title:
  E-mail folder names are not localized in thunderbird 68

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