class CopyTunerClient::I18nBackend

def lookup(locale, key, scope = [], options = {})
  return nil if !key.is_a?(String) && !key.is_a?(Symbol)
  parts = I18n.normalize_keys(locale, key, scope, options[:separator])
  key_with_locale = parts.join('.')
  key_without_locale = parts[1..].join('.')
  if CopyTunerClient::configuration.ignored_keys.include?(key_without_locale)
    CopyTunerClient::configuration.ignored_key_handler.call(IgnoredKey.new("Ignored key: #{key_without_locale}"))
  end
  content = cache[key_with_locale] || super
  cache[key_with_locale] = nil if content.nil?
  content
end