Hi,
In the WAR package there should be a directory called 'extensions'.
Copy the contents (the sub-dirs) from this to 'tomcat/shared/classes/alfresco' - note, you may have to create some of this directory path.
In the extensions package is a file called 'web-client-config-custom.xml' that enables a bunch of languages (the langauge files will now be in 'tomcat/shared/classes/alfresco/messages').
Note, the files:
custom-db-connection.properties
custom-hibernate-dialect.properties
might have to be renamed because they contain settings to make Alfresco use HSQL - since you are already running this will interfere with your current setup. (Or you could modify the files to match your current setup - that way you can redeploy new WARs and keep the same configuration).
Hope this helps,
Steve