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style preferences and Live Caption, on one settings subpage.

This CL makes some adjustments to the captions subpage in settings
according to the latest UX spec (https://docs.google.com/presentation/d/1YO10r3-ybP-L9uTNCClAQO9Er0gjwWMOLVKY98u59qU/edit#slide=id.g8ea378aef4_0_0):
 - Rename some strings
 - Change some indentations and spacing
 - Add the Live Caption toggle

The Live Caption toggle is removed from the a11y page for operating
systems that show the captions subpage (ChromeOS, Linux, some versions
of Windows). For operating systems that do not show the captions subpage
(MacOS, some versions of Windows) the Live Caption toggle is still shown
on the a11y page.

Bug: 1055150, 1111002
Change-Id: If4cb2b236ef0561a9cb75d7d921ede9fccf401af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468756Reviewed-by: Evan Liu <evliu@google.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#817139}