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This CL adds I18nBehavior.i18nRecursive and uses it for parametrized strings in
Chrome OS Sync Consent screen.

Bug: 822889
Change-Id: I0ca8c3b7a45ee1cea8a80a0e8ace388e958709c4
Reviewed-on: https://chromium-review.googlesource.com/1166464
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582309}