Here are the language files for Zimbra 3.1.1-GA-394. As usual, the files go in the directory /opt/zimbra/apache-tomcat-5.5.15/webapps/zimbra/WEB-INF/classes/msgs.
As noticed in previous versions, sometimes a single quote alone (like ') made things to crash. Therefore I use \u00b4 everywhere (it looks like an accent without a letter below).
All feedback is very welcome.