Fixed: CustomerTicketMessage does not show loading icon for dynamic fields (bug#9673).
Squashed commit of the following:

commit 787bbf723fa02061c255aedccd6360bb8958cc25
Author: s7design <otrs@s7designcreative.com>
Date:   Tue Feb 4 06:52:44 2014 +0100

    [Bug 9673] CustomerTicketMessage does not show loading icon for dynamic fields

    Added part of code that create a string with the  dynamic field for update on AJAXUpdate