It's been tried before a few times and hasn't worked for a simple reason: people don't generally deal with other people who don't speak their language. Think about it: how many times has this ever been a problem for you? Or anyone you know?
The hard thing in the translation business is scaling up demand (there are tons of translators in most language pairs so pricing is really competitive and it is hard for a middleman to make money). And if you somehow manage to get a lot of business you then have to manage the HR side of keeping a lot of people working efficiently at scale while making sure you're still getting great quality.
Both of these are difficult problems, especially since there isn't an obvious technical way to lower customer acquisition costs enough to compete with independent translators. That said, if you can find a solution to the first problem (reliably getting business) you can monetize it much more easily than by solving the second, if only because anyone who already has translation business at scale will be reluctant to screw with the organizational processes that are making them money in a cutthroat market.