Maybe this is an idea? I saw this google translate boomerang and I wondered why there is no simple minimize to tray google translate app? WHere you can select predefined language sets (like English - French, German - Spanish, etc). And click, wait couple of secs and you have your translation? Is it possible? Maybe with some copy result to clipboard thingy?
I've been googling, but only found some outdated widget which I can't use.