title: highcharts bubble change series name
body: <p>I create a graphs on my site. It get the information from my db mysql and so It always update.</p>
  
  <p>Now I want create, for each user of my site, a bubble chart with the visit, like and comment to every post.</p>
  
  <p>Now my problem is that I want to rewrite the legend (Now the script write Series 1, series 2,...) with the name of my user.</p>
  
  <p>Thanks to all.</p>