def exists?(key, _locale = nil, locale: _locale)
      locale ||= config.locale
      raise Disabled.new('exists?') if locale == false
      raise I18n::ArgumentError if key.is_a?(String) && key.empty?
      config.backend.exists?(locale, key)
    end
def exists?(key, _locale = nil, locale: _locale)
      locale ||= config.locale
      raise Disabled.new('exists?') if locale == false
      raise I18n::ArgumentError if key.is_a?(String) && key.empty?
      config.backend.exists?(locale, key)
    end
Returns true if a translation exists for a given key, otherwise returns false.