Videochat with simultaneous translation

I am working in a website developed on Joomla 1.5, platform working on PHP+MySQL. I need to implement in this website a videochat with simultaneous translation English -> Portuguese, Portuguese -> English. This solution will be developed with an open-source language, PHP, Java, Javascript etc. I know it is possible to use the Google or Microsoft API-Translator, but I need that in the budget it is specified how much it will cost to hire those services, since they have or will have a cost. How much it will cost to develop a videochat with simultaneous translation? What will be the deadline for delivering this service? Payment: how to find a way in which we ensure I have safety in receiving a solution fully working and you in receiving it? Kind regards,