This commit fixes a bug where the silence button is incorrectly displayed on the admin page of a staff user. It's not actually possible to silence a staff user because the backend correctly prevents it, but the frontend isn't checking if the button should be displayed.
Another small bug that this commit fixes is the similar users list not showing up inside the silence/suspend modals due to also a bug in the frontend.
I've also changed the way similar users are loaded so that they're not returned by the `admin/users#show` endpoint anymore and moved them into a new endpoint that the penalize modals (suspend and silence) can call directly to retrieve the list of users. This is done because the similar users list is never shown on the admin user page (`/admin/users/:user_id/:username`); they're only needed when the suspend or silence modals are opened.
Internal topic: t/130014.
Adds a site setting to include a post's content in penalty message.
When silencing/suspending a user from a post, or a reviewable with
a post, adds an option to include a post's content in the email
message by default.
As of #23867 this is now a real package, so updating the imports to
use the real package name, rather than relying on the alias. The
name change in the package name is because `I18n` is not a valid
name as NPM packages must be all lowercase.
This commit also introduces an eslint rule to prevent importing from
the old I18n path.
For themes/plugins, the old 'i18n' name remains functional.
