Example of changing Like to Vote in newsfeed sharepoint 2013

var anchors = document.getElementsByTagName('a');
for( var i=0;i<anchors.length;i++)
{
 var b = anchors[i].innerHTML;
 if(b=='Like')
 {
 anchors[i].innerHTML='Vote';
 }
else if(b=='Unlike')
{
anchors[i].innerHTML='UnVote';
}
}

You can insert this script into a page , using script editor webpart