We were getting a warning because it won't be included by default in
Rails 6.1:
DEPRECATION WARNING: Using I18n fallbacks with an empty `defaults` sets
the defaults to include the `default_locale`. This behavior will change
in Rails 6.1 . If you desire the default locale to be included in the
defaults, please explicitly configure it with
`config.i18n.fallbacks.defaults = [I18n.default_locale]` or
`config.i18n.fallbacks = [I18n.default_locale, {...}]`. If you want to
opt-in to the new behavior, use `config.i18n.fallbacks.defaults = [nil,
{...}] `.
19da667478