Hi, James!
If you're still interested in having a translation plugin, I can suggest you
this service.
First of all, it gives you 10000 requests a day for a single API key. And second, Yandex company is not known for monetizing their products by totally blocking free access, unlike those "corporations of good and justice", which were mentioned before (after all, it was made in the country of communists
). So, it's pretty unlikely that this service will be broken soon.
No TTS in this API though, just text.