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Hire a professional translator and a local copywriter. Get the site translated and then have a copywriter who understands your business and the local market rewrite the site to appeal to the local market.
For local SEO purposes it is often a good idea to put local content on a country domain (i.e., Japanese - .jp, Simplified Chinese - .cn, etc.)
Unfortunately I'm not sure how you would do this in Joomla. Can Joomla handle multiple sites from one install?
Joom!Fish - Multilingual Content Manager [extensions.joomla.org]
[nooku.org...]
I am guessing but that's the logic which comes from an old coder's mind.