dic = {"foreignNames":[  
    {  
      "name":"Archange Avacyn",
      "language":"French",
      "multiverseid":411061
    },
    {  
      "name":"Erzengel Avacyn",
      "language":"German",
      "multiverseid":410731
    },
    {  
      "name":"Arcangelo Avacyn",
      "language":"Italian",
      "multiverseid":411391
    },
    {  
      "name":"大天使アヴァシン",
      "language":"Japanese",
      "multiverseid":411721
    },
    {  
      "name":"대천사 아바신",
      "language":"Korean",
      "multiverseid":412051
    },
    {  
      "name":"Arcanjo Avacyn",
      "language":"Portuguese (Brazil)",
      "multiverseid":412381
    }
]}

def find_lang(lingua):
	for i in dic['foreignNames']:
		if(i['language'].lower().startswith(lingua.lower())):
			return i
	return None

lang = find_lang('portuguese')
print(lang)