How can you contribute?
Tatoeba is primarily about collecting sentences and translating them into many, many languages. So one obvious thing you can do to contribute is to translate sentences.
But you don't have to be a polyglot in order to contribute! You can help us a lot simply by checking sentences and reporting mistakes. This is something everyone can do!
If you have a good microphone, you can also bring more audio to Tatoeba by recording sentences.
You can help us promote the project. Tell people around you that Tatoeba exists. This is a very ambitious project, so we will need as much help as possible.
And finally, you can join the team. You can help us code new features, improve the usability, debug, optimize, ensure there's no security flaw, etc.