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This CL changes the identity internals from using the old i18n-content
to the new $i18n{} replacement.

Bug: 677338
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ia603e5463eaff981a6bf7902d8eff36642602f5d
Reviewed-on: https://chromium-review.googlesource.com/872431Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530648}