var divs = document.querySelectorAll('div.part_text');

function textNodesUnder(el){
  var n, a=[], walk=document.createTreeWalker(el,NodeFilter.SHOW_TEXT,null,false);
  while(n=walk.nextNode()) a.push(n);
  return a;
}

function fixLines(tc)
{
  var e = tc.split('\n');
  var s = '';
  for (var k = 0; k < e.length; k++)
  {
    var ss = e[k].trim();
    if (ss.startsWith('-')) ss = '—'+ss.substring(1);
    s += ss+'\n';
  }
  return s.trim();
}

for(i=0; i < divs.length; i++)
{
  var tn = textNodesUnder(divs[i]);
  for(j=0; j < tn.length; j++)
  {
    var s = tn[j].textContent.trim();
    tn[j].textContent = fixLines(tn[j].textContent);
  }
}