Fix indentation for or-then and and-then nodes

[pyanzin]

Different levels of tabbing shouldn't be allowed.

'$t$ranslate' -> host = 'translate.google.com'
  '$/'
    or
      'from $russian' -> anchor = 'ru'
      'from $english' -> anchor = 'en'
      'from $spanish' -> anchor = 'es'
      'from $german'  -> anchor = 'de'
      'from $french'  -> anchor = 'fr'
      '$autodetect'   -> anchor = 'auto'
then
      or
        'to $russian' -> anchor /= 'ru'
        'to $english' -> anchor /= 'en'
        'to $spanish' -> anchor /= 'es'
        'to $german'  -> anchor /= 'de'
        'to $french'  -> anchor /= 'fr'
      then
        freetype -> anchor /= _