public LocalClientSession createClientSession(Connection conn, Locale language) {
        return createClientSession(conn, nextStreamID(), language);
    }
Creates a new {@code ClientSession}. The new Client session will have a newly created
stream ID.

@param conn the connection to create the session from.
@param language The language to use for the new session.
@return a newly created session.
xmppserver/src/main/java/org/jivesoftware/openfire/SessionManager.java