I bought Samsung Galaxy Tab 7.7 in Hong Kong. The System has some pre-installed languages but I need to install an additional locale (Polish). I tried "More Locales 2" from the Market and it worked but not as I expected. Some text is fully translated, but others are not. Is there any way to localize it correctly? Polish locales are supported by Android 3.2 but I do not know how to install them manually.
I believe you should install the European version of Samsung's ROM or any other ROM of choice. This XDA thread lists official firmwares for your device.