Translation of site content via an API

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I've had a client ask about usinghttp://www.translationplugin.com/... for translating site content. (Specifically the API)

Has anyone had any experience with something of this nature?

The intention is that when someone edits the english version of the site a new request is made to translate the relevant languages.

The current process involves exporting the site, translating the content and then re-importing the site but I'm now investigating options for more granular translation.

TheRealSean