Thank you for creating a Greek translation. It's quality is great as well!
There's a minor spell error: when the viewer is offered to retrieve a license key from RU Relay, two options are offered basically, either accept or skip the step altogether. Skip has been translated as Παράληψη which means to forget something. The correct term is Παράλειψη.
Like I said, just a small thingy to fix at a later stage :)