[Bug 1846371]

[Francesco-lodolo]

(In reply to Zibi Braniecki [:zbraniecki][:gandalf] from comment #10)
> Can you revert that change in L10nRegistry.jsm and see if you can still reproduce? I doubt that this is the culprit because this change doesn't really affect anything except of protecting against race between sync/async.

Artifact build from current mozilla-central tip

1) Build and run
2) Create a new profile
3) In `about:config` set `intl.multilingual.enabled` to true
4) Install French language pack from the latest mozilla-central-l10n available, luckily there might not be new DTD strings loaded on startup…. In my case this worked
http://archive.mozilla.org/pub/firefox/nightly/2019/10/2019-10-04-09-46-56-mozilla-central-l10n/linux-x86_64/xpi/
5) Open preferences, switch the language to French and restart. At this point, the browser should reopen on Preferences in French, but they're in English, even after reloading the page.

I tried undoing the changes to L10nRegistry.jsm, but it didn't solve the issue. But removing `data-l10n-sync="true"` from `browser/base/content/browser.xhtml` seems to do it.
https://hg.mozilla.org/integration/autoland/rev/1f622156e9eab1d2c58d5d77bb5908fcc83db253#l4.13

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https://bugs.launchpad.net/bugs/1846371

Title:
  firefox 70.0 beta 11 isn't fully translated

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