Support auto-highlighting for preformatted code

So far all the code that was inserted using the “Preformatted text” button in the editor has appeared without highlighting on our forums.

An example snippet that I had to manually edit to add the tripple quotes and language definition:

var sm = ko.views.manager.currentView.scimoz;
// Get character length:
var msg = "Length: " + sm.getTextRange(0, sm.currentPos).length;
// Get byte length:
//var msg = "Length: " + sm.currentPos;

// Use statusbar to show where you are:
ko.statusBar.AddMessage(msg, "find", 5000, true);

Seems to not be working here either? Of course I can manually add the tripple quotes and language definition but the point is that this should happen automatically when using the “Preformatted text” button.