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This adds a new strings file for Nearby UI. Also adds strings and an
icon used in the notifications for Nearby.

Bug: 1102348
Change-Id: Ic5efac87078ad5bd9e26b714952395fcaabad995
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283306Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Alex Chau <alexchau@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786045}