I prefer #47, it's been made with quite a bit more attention to detail. The glasses suggest intelligence which is good for a translation service and it does be

I prefer #47, it's been made with quite a bit more attention to detail. The glasses suggest intelligence which is good for a translation service and it does better in greyscale suggesting that the contrast has a lot of information and is memorable. The font is a little broken though, particularly the "a" and how the ".com" doesn't align with the baseline.