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This CL adds strings used in the new dialogs.

Dialog screenshots (margins aren't final):
https://drive.google.com/open?id=1j5P7OyZognlhF6dXkb1cTAh1hXsSjQ9H
https://drive.google.com/open?id=1MSonPoMLYt0lfLeq9NfP5yoH15EeVZ6c

Bug: 848891, 849020
Change-Id: Id48ed23018b3171d2dc7d6a9e492594487fcf7d5
Reviewed-on: https://chromium-review.googlesource.com/1112659Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569859}