For anyone interested in removing the word "[Beta]" from the IM tab in ZCS, here is the hack. You need to modify the imAppTitle line within the files listed below.

Code:
{ZIMBRA}/jetty/webapps/zimbra/WEB-INF/classes/messages/ZmMsg*.properties
{ZIMBRA}/jetty/webapps/zimbraAdmin/WEB-INF/classes/messages/ZmMsg*.properties
Not sure if these steps are needed but, you might also need to clear the {ZIMBRA}/jetty/temp directory, restart zimbra, and clear your browser cache.