chore: Credit translators properly

[kjarosh]

This adds a TRANSLATORS file to acknowledge and credit contributors who provided translations for Ruffle.

Crowdin unfortunately does not allow crediting translators when synchronizing translations (crowdin/github-action#35).

[torokati44]

Hah, I've only ever actually contributed Hungarian translations - the rest were small typo fixes, restored earlier submissions by others, etc... 😅

[torokati44]

And maybe @Dinnerbone is in a similar situation? Not sure...

[kjarosh]

A contribution is a contribution! Even fixing typos and selecting better translations are considered contributions (IMO at least). The same way our code is changed: most of the time we edit and improve existing code, but each (even the smallest) contribution is credited in the commit history.

[torokati44]

and selecting better translations are considered contributions

In at least one occasion, it wasn't even a selection - just mass-copying the old strings after the source texts changed ever so slightly. But fine, I don't mind being listed many times... 🤷‍♂️

[torokati44]

Thank you!

[torokati44]

BTW, somewhat related:
https://github.com/ruffle-rs/ruffle/blob/master/LICENSE.md#third-party-libraries and https://github.com/ruffle-rs/ruffle/blob/master/web/LICENSE.md#third-party-libraries are redundant (or unnecessarily overlapping?), and are getting more and more outdated every week.

https://crates.io/crates/cargo-attribution and https://www.npmjs.com/package/@electrovir/oss-attribution-generator (or similar) might come in handy in updating these.