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This change adds strings needed for the banner and modal elements.
It includes screenshots for the banner text since those likely require
the most context.

Bug: 1014959
Change-Id: I19772873bb386dd7726d348b90e776f0ddc628e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1902717Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714924}