Mark some string translatable

Please review all the &lt;Item&gt;...&lt;/Item&gt;, &lt;Name&gt;...&lt;/Name&gt;, etc. tags in Kernel/Config/Files/Ticket.xml (and in *.xml), because I think there are many more string which needs to be translated, but they're not.
And please, don't use CamelCase strings, because translators can't decide if it is a value of a parameter or a string to translate. Use separete words instead. For example: instead of "CustomerAgentTicket" use Customer Agent Ticket".