i18n.rb

# Always raise errors when I18n translations are missing. To override this
# behavior:
#
#     I18n.t :some_key, allow_missing: false
I18n.exception_handler = -> exception, locale, key, options do
  if options.delete(:allow_missing)
    I18n::ExceptionHandler.new.call(exception, locale, key, options)
  else
    raise I18n::MissingTranslationData.new(locale, key, options)
  end
end