chore(ui): Change icon and rename print to download invoice (#3597)

Author: kushthedude

app/templates/orders/view.hbs

@@ -30,8 +30,8 @@
         {{t 'Download Tickets'}}
       </button>
       <button {{action 'downloadInvoice' model.event.name model.order.identifier }} class="ui labeled icon blue {{if isLoadingInvoice 'loading'}} button">
-        <i class="print alternate icon"></i>
-        {{t 'Print Invoice'}}
+        <i class="download icon"></i>
+        {{t 'Download Invoice'}}
       </button>
     </div>
   </div>