Get user's preferred languages with JavaScript

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If you have different language settings in your website or application wouldn't it be great if you could automatically set the language the user prefers? Doing so may be easer than you think. All you have to do is use navigator.language or better, navigator.languages.
navigator.language and navigator.languages?They're basically the same, except navigator.languages is newer and should return the whole list of user languages by order of preference. This is great in case you don't have a translation in their top language, but perhaps you do for a fallback.
Speaking of fallbacks since navigator.languages implementation is experimental at the time of writing, it is wise to use navigator.language as a fallback value. Just remember to wrap it in an Array for consistency.
navigator.languages ([navigator.language] as fallback) we get the preferred language list