query: #by Jura1, 2016-01-24
  
  SELECT ?lang (COUNT(DISTINCT(?monolingualstring)) as ?count)
  WHERE
  {
    ?item wdt:P3909 ?monolingualstring .
    BIND(lang(?monolingualstring) as ?lang)
  }
  GROUP BY ?lang
  ORDER BY DESC(?count)
  LIMIT 50