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One thing to note is when you want to pass a value from a decorated page to a decorator using the <ww:set> tag, you need to specify a scope (request, session, application) if the decorated page is invoked directly (not a result of an action). By default if no action has been executed and no scope was specified, the set value will only availlable from the same PageContext.
There are a few caveats with using WebWork's localization in Sitemesh Decorators. Take a look at Using Localized Texts in Sitemesh Decorators.