We use Crowdin to make translating easier. You can request access to the SiraLocalizer project by filling out this form. We will get back to you as soon as possible!
Testing translations that haven't officially been added to the mod yet is very easy. First, navigate to the language you want to download (this example uses French):
Then, press the 3 dots to the right of Beat Saber and press Download.
This will download a file called sira-locale.csv. Simply put this file in the UserData\SIRA\Localizations folder of your Beat Saber installation and you're good to go! Note that if the language you want to test isn't included in SiraLocalizer yet, you will need to open the UserData\SiraLocalizer.json file and change showIncompleteTranslations from false to true.