I think that gaining levels should be rewarded with opportunity to Contribute more, and doing so unlocks a new type of badge and task. Then doing THAT allows us to do more from outside the app, like reporting an incorrect translation or extraneous data or something. And leveling this type of "extra credit" earns the opportunity to correct these finds and/or validate a correction. (If no one corrects that person's submission, they should have a chance to offer one, then it goes to someone else for validation.) And if a public correction is made, a small compensation is paid to the contributors for their parts.
Google is not a non profit organization. And we do all these translation for fun. Nothing comes free in this world. I would not prefer to do this for free. If not something great then at some level if something like music or video subscription.
The reason this app has only yielded itself two of my stars is simply because unless Google offers rewards, e.g. Credit to spend on Google Play, it seems to lack benefit for the user, who would be better off spending their time on more important activities. Make the requested change and all five stars shall metaphorically shine. Until then, it's getting uninstalled and staying that way.
Google keep on thinking of fun new ways to help them compile data. This is a great way to make it like a game. Don't mind helping since we all win in the end.
It would be nice to have some sort of rewards like the "Rewards" app, but I'm happy to help. It's a way to give back! :)
I had a chance to choose a mood for the text advertising an escort service in Mumbai. That's not PEGI-12 :D
We've got some shiny badges for you. And a fun new type of task.