Hi,
The problem is more likely how gTranslate works – it translates the page on-the-fly, and not on the server side (or it does not seem like that). The plugin is inserting/removing/changing nodes whenever the results are printed to the page, by sending requests to the google translate servers. The translate plugin may have event listeners set to some node changes or perhaps the ajax handler – but may not be able to translate/cacth everything for translation.
If there was a javascript API of some sort available, we could somehow tell the other plugin which texts to translate on which events, but without that this is not possible.