Some years ago I used Lingua::Translate to convert from English to French.
It was not a complete success!

As Google Translate improved, the need to go elsewhere pretty much disappeared and, typically, I wouldn't consider going anywhere else as they seem to have the best-in-class solution. But your case is an exception...

Lingua::Translate used Babelfish from Yahoo! which I believe was shut down. But there is BabelFish which may have an API that is helpful to you.