dev #13296 Add html attribute title to treeselect items

This allow to see the full name of an item when it's too long

public/admin/js/treeselect/treeselect.js

@@ -83,7 +83,7 @@
       var self = this;
       return	$("<li class='ui-treeselect-"+type+"'>"+
 		  this._addCheckbox(catOrItem)+
-		  "<a class='ui-state-default' href='#'>" +
+		  "<a class='ui-state-default' href='#' title='" + catOrItem.label + "'>" +
 		  this._addIco(catOrItem)+
 		  catOrItem.label+
 		  "</a>" +