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There are three main changes needed to improve the ChromeVox experience for the
settings OS language page:

-Apply aria-hidden to the language labels to remove them from ChromeVox
 navigation. Instead only navigate to the associated buttons

-When a user chooses a language to display the system text in, a Restart button
 is displayed on the screen. That Restart button needs a label to better
 describe/announce its purpose.

-Each item in the "Input method" keyboard list used two ChromeVox navigation
 stops instead of one. Applying aria-hidden to the inner div then aria-label to
 the outer div fixed this behavior

Screen captures:
Before: https://bugs.chromium.org/p/chromium/issues/detail?id=976452#c15
After: https://bugs.chromium.org/p/chromium/issues/detail?id=976452#c16

Bug: 976452
Change-Id: I90a70f3c4197a3b0f6eea3f8696d36766eba373d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1952091
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723548}