[SOLVE] Change Share logout URL

Hi, i need to change the logout link in share (Alfresco 4.2.e).

I tried to replace in share-config.xml the line:

<item type="link" id="logout" condition="!context.externalAuthentication">/dologout</item>

with:

<item type="external-link" id="logout">https://www.google.it/</item>

but it does not work.

How can i change the logout URL?