Replace placeholders by value in policy localized json files

The localized files generated from policy_templates.json contain
placeholders such as $1, the placeholders should have their real
values.

Bug: 976254
Change-Id: I8b7ed1a61bceeef1d7443736f3f0176acaaee233
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1666702
Commit-Queue: Yann Dago <ydago@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675094}
6 files changed