Hello,
I apologize for my delay.
Well, plugin translations are typically included in the plugin. However, I believe the only translation I have been lucky enough to receive is Spanish (and it’s probably incomplete).
I have no idea how plugin developers get their plugins translated (friends, a premium service, ??). I hate to rely on Google Translate; since I know it can “guess” sometimes… and I would absolutely hate to have any text translated inappropriately.
If you are interested on working on a translation; I can provide you with the resources and instructions. It may be a bit time-consuming; but very rewarding ??