HEADS UP! i18n 1.1 changed fallbacks to exclude default locale.
But that may break your application.
Please check your Rails app for 'config.i18n.fallbacks = true'.
If you're using I18n 1.1.x and Rails (< 6.0), this should be
'config.i18n.fallbacks = [I18n.default_locale]'.
If not, fallbacks will be broken in your app by I18n 1.1.x.
For more info see:
https://github.com/svenfuchs/i18n/releases/tag/v1.1.0
appveyor で i18n に関するエラーが出ている
https://ci.appveyor.com/project/sakuraeditor/changelog-sakura/builds/20941794