[MD settings] change i18n() use in html to $i18n
This CL switches i18n('') behavior use in html files to use $i18n
instead. The i18n('') is still used in JavaScript files.
These changes are mechanical changes.
(Bonus, there a few i18n-content/i18n-values changes as well).
BUG=
611188
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation
Committed:
https://crrev.com/4e031cc226e978981fb1589eaa20d3b635968d46
Cr-Commit-Position: refs/heads/master@{#393587}