Contributions are welcome! Create an issue, explaining a bug or proposal. Submit pull requests if you feel brave. Speak to me on Twitter.
Translations of the natural language strings are managed through a third party translation interface, transifex.com. Newly added strings will be periodically uploaded there for translation, and any new translations will be merged back to the project source code.
Please use https://www.transifex.com/projects/p/silverstripe-userforms to contribute translations, rather than sending pull requests with YAML files.