How does Transifex assure translation quality?

Transifex identifies more than 290 languages and associates them with a locale code. These languages adhere to the ISO 639-1 standard of language names and locales. You might fallback to 639-2 or 639-3 if your language is not covered in 639-1. For a full list of supported languages, please refer to our Languages page: http://www.transifex.com/languages. If your language isn't in the Languages page and your files appear in a shortened version like ‘xx_YY', then you can help us providing the necessary information in order to add your language into Transifex. You can check the Unicode standard for Language Plural Rules and check that the rules for your language are correct. If so, let us know. Otherwise, try to find an authoritative source for the correct data and point us to that.