Bump i18n-js from 3.9.2 to 4.0.0

Bumps [i18n-js](https://github.com/fnando/i18n-js) from 3.9.2 to 4.0.0.
- [Release notes](https://github.com/fnando/i18n-js/releases)
- [Changelog](https://github.com/fnando/i18n-js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/fnando/i18n-js/compare/v3.9.2...v4.0.0)

---
updated-dependencies:
- dependency-name: i18n-js
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

config/initializers/i18n.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+Rails.application.config.after_initialize do
+  require 'i18n-js/listen'
+  # This will only run in development.
+  I18nJS.listen
+end