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Following UX writing review, update the relevant strings and layout.
See go/cros-assistive-input-ux-writing-review.
Current view: http://screen/9cXRfLiVR9M

Add icon-secondary-color as specified in http://go/cros-ux-icon-color.
Added a TODO to rename the rest of the files and strings in code.

Bug: 1113612, 1113611
Change-Id: I4360a23addbc7e92bb6eca614e7dd543470f9792
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341023Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795810}