Ok this is a hard one, convert numbers to text?

Ok this is a hard one, convert numbers to text?

What I mean by prices/numbers to text is something like this :

1902 $ ----> One thousand nine hundred two dollars

Not only that, but we need this in French.

Is it possible?

1) If it is, great. How?
2) If not : Suppose we hire a programmer to make a script (php, javascript, whatever is most convenient) how can we integrate the result of that script in our invoices and estimates?

Is there a way--for example-- to modify the templates to get this as a dynamic variable from somewhere?

Any help towards making this possible would be appreciated. Zoho Books is working great for us so far, if we can make this last functionality possible Zoho Books will be just perfect for us.