Translations

Fork the repository.
Open the lang directory.

Adding a new language

Google your language code and create your_iso_language_code.json.
Copy translations of another language (one which you are comfortable translating from).
Translate all of the strings to that language.
Commit with a message like "Add [language name] translations".

Modifying an existing language

Open the translation file you want to modify.
Make your changes and add your name to "authors".
Commit with a message like "Modify [language name] translations".

Other contributions

If you're fixing a bug or adding a new feature, please:

Use verbs in their present forms in your commit messages.
Avoid using emojis and other non-usual characters in your commit messages.