Feature added ZK-2227: ZK Messages support Polish lang
http://tracker.zkoss.org/browse/ZK-2227
Merge remote-tracking branch 'Noah/F65-ZK-2227' into 6.5
Bug fixed ZK-2231: Invisible window inside vbox cause js error when calculating flex size
http://tracker.zkoss.org/browse/ZK-2231
Bug fixed B65-ZK-2214: [IE8] grid frozen no show horizontal scroll bar when column visible = "false"
http://tracker.zkoss.org/browse/ZK-2214
Bug fixed ZK-2200: Navigate combobox drop down list by "down" key not work correctly if contains empty string
http://tracker.zkoss.org/browse/ZK-2200
Merge remote-tracking branch 'Noah/B65-ZK-2231' into 6.5
Merge remote-tracking branch 'Noah/B65-ZK-2200' into 6.5
Bug fixed ZK-2193: Listbox will scroll in horizontal direction when navigation by keyboard
http://tracker.zkoss.org/browse/ZK-2193
Refix Bug B65-ZK-2210: improve zk portlet 2 integration
http://tracker.zkoss.org/browse/ZK-2210