Thanks for reaching out. The decision to approve content is taken by the video owner. Also, Our Help Center article on 'Contributing translated content' has more info: https://goo.gl/WpQuFD . Hope this clarifies.
@TeamYouTube I have a question. How long does it take for a contribution (translation) to be published? Sometimes it only takes hours and now I've been waiting for several days. 
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OK Thank you very much :)
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