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Reused existing strings where possible added new strings to grit file
for translation.

Bug: 805533
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I0d38ddfe0ccec27c9c3f28cb04e9717b983d650c
Reviewed-on: https://chromium-review.googlesource.com/935447
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539147}