I have just moved to xcode4 and boy am i confused! :)
For one, in the screenshot, you could see the localizable strings, a couple of the file names changed to \"null
The languages will be read from NSGlobalDomain's AppleLanguages. Try to add your own identifier to that list.
% defaults read NSGlobalDomain AppleLanguages
("en_GB", en, fr, de, ...)
% defaults write NSGlobalDomain AppleLanguages "(HongKong, "en_GB", en, fr, de, ...)"
% defaults read NSGlobalDomain AppleLanguages
(HongKong, "en_GB", en, fr, de, ...)