I suggest that Google Translate adds an additional panel on the translate text page that automatically translates the translation back to the original language to give an indication of how good the translation is. I'm doing this by copy and pasting the translated text and reversing the translation. It is a bit messy and would be better if done automatically. If you get the same as the original text, this confirms that the translation is reasonably good and says what you want it to say. I hope that this is useful. NB. It's very good and presumably will get more accurate as people contribute better translations.
