Plugin placeholders: Replace i18n-values with $i18n{}.

Bug: 677338
Change-Id: Ice2fa72f21ce003fd594af7ca4aacd2012a2d40a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1489954
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639284}
6 files changed