Now they've partnered with some professional translation firms so you can get a quote, order, receive and pay for professional translation - all within YouTube / Google. So you don't have to worry about whether your friend's high-school Spanish is really good enough for your international audience!
The first step to doing this is uploading a transcript file for your video. Something to bear in mind if you do this: If SEO matters for your blog, then you probably don't want to put the transcript into both YouTube and the blog, because that would create duplicate content.
Thanks for reading: Easy professional translations for YouTube video captioning, Sorry, my English is bad:)