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This is a reland of 73ac7d88

The reland changes the test locale from 'es-ES' to 'es'. 'es-ES' is
unavailable on Mac, while 'es' works (confirmed crash and fix locally).

Original change's description:
> Keep DevTools navigator.language in-sync with chromiums app language
>
> DevTools is considered part of the Chromium UI, so it should be
> displayed in the same language as the Chromium UI and not the configured
> accepted language (chrome://settings/languages).
>
> This CL moves the code where we override the DevTools renderer
> preferences around so it works consistently across platforms. It also
> installs an event handler in case the user changes his language settings
> so `navigator.language` has consistently the same value in the
> DevTools renderer.
>
> R=petermarshall@chromium.org
>
> Bug: chromium:1125490
> Change-Id: Iaac568d82357d6ae7c50d5022d687f4f1741b147
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398538
> Commit-Queue: Simon Zünd <szuend@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Reviewed-by: Peter Marshall <petermarshall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#805219}

Bug: chromium:1125490, chromium:1126379
Change-Id: I3b24b73ecb19d8290393a8ebf72db424bc098eee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401464Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805704}