[Bug 662840]

[Dminor]

There's failures on test-verification with these changes, but there's
failures on test-verification on these tests without the changes as
well, e.g.
https://treeherder.mozilla.org/jobs?repo=try&revision=99fedcc1a058b3377c7def7938d3f27173edaee6
where I added some comments to trigger test-verification on the existing
tests.

Fixing https://bugzilla.mozilla.org/show_bug.cgi?id=1760824 should help
make the tests less flaky. I've tried to improve them a bit as part of
these changes as well.

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https://bugs.launchpad.net/bugs/662840

Title:
  Spell checking more than one language in Firefox

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