def content(lang='')
      filename = content_filename_full(lang)
      return nil if filename.nil?
      return '' if !File.exists? filename
      File.read(filename)
    end
def content(lang='')
      filename = content_filename_full(lang)
      return nil if filename.nil?
      return '' if !File.exists? filename
      File.read(filename)
    end
content