Fix copy/move to folder with numerical prefix

Fixes #2658

NEWS

@@ -3,6 +3,8 @@
 
 Bug fixes
  - fixed possible exception when retrieving the default event reminder value on 64bit architectures (#2647, #2648)
+ - disable file paste support in mail editor (#2641)
+ - fixed copying/moving messages to a mail folder begining with a digit (#2658)
 
 2.2.1 (2014-03-07)
 ------------------

UI/WebServerResources/MailerUI.js

@@ -2857,7 +2857,7 @@ function Mailbox(type, name, unseen, displayName) {
     else
       this.displayName = name;
     // log("name: " + name + "; dn: " + displayName);
-    this.name = name.asCSSIdentifier();
+    this.name = name;
     this.unseen = unseen;
     this.parentFolder = null;
     this.children = new Array();
@@ -2878,7 +2878,7 @@ Mailbox.prototype = {
 
         var currentFolder = this;
         while (currentFolder.parentFolder) {
-            fullName = "/folder" + currentFolder.name + fullName;
+            fullName = ("/folder" + currentFolder.name).asCSSIdentifier() + fullName;
             currentFolder = currentFolder.parentFolder;
         }