I've read on this forum as following;
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Yes, Designer will support internationalization, but we don't know yet how. Here are some ideas:
1. It will not support complex expressions like you show, i.e. only single expression will be supported;
2. Most probably it will support "Externalize string" feature of Eclipse, i.e. will look for something like Messages.getString("Test.0"), parse class Messages and then read real strings from property file.
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This is very enough for me, and I'm wondering when I will be able to use it!