Read my Flex 3 Cookbook post on building the localized framework files. It will be essential to building a well internationalized application:
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After reading the documentation I had the problem that all new locales didn't work.
The compiler reported the following task(s):
Unable to open C:\Program Files\Adobe\Flex Builder 3\sdk\3.2.0\frameworks\locale\<xy> ....
Your blog solved my Problem.
Is it really the problem that Flex is not I18n able for its own components? Does every developer have to translate and compile the default properites for each local he wants to use???? Thats horrible. - oh btw Japanese is supported in my version.
Flex 4 has the framework resource bundles translated for 16 languages, so that's good, but yeah, that was something that always amazed me.