No way. It all comes down to the most expensive piece of most software - if they write a translation feature, and it works 98% of the time, that's a complete success. That last 2% will probably take way longer to whittle down than the feature took to deploy

Even if the percentage was lower (and honestly I think it's even higher from my own use), to even figure out if it's worth it you'd have to put man hours on breaking down the numbers, estimating alternatives, and then actually doing the work

In this case, I don't think it's actually feasible - translation isn't that resource intensive. If you've already done the cheap language detection so you don't run it on everything and are using a reasonably efficient translation method, the last few percentage points of accuracy would probably take more resources than the occasional pointless work