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This means that localization is performed before data is sent to the
WebUI client. This CL removes almost all existing i18n-template usage.
We still have a small number of more complex strings which are created
in JS which are more difficult to convert to the new system.

BUG=563884

Review URL: https://codereview.chromium.org/1609683002

Cr-Commit-Position: refs/heads/master@{#381604}