Nope, I buy nothing (except strong coffee). Put your title & description into translate.google.com, then select one of the 95 or so languages. In Yt go to your video and "Translations" tab, then "Translate into" and "Add new language". Search and select the language from your current page on translate.google.com. Copy and paste. That's it. Repeat 95 times
. If your title & description is keyword rich, Google does a very good of translating those tags into foreign language that are actually relevant. The grammar may be off, but we don't care about that, we're concerned with populating the metadata with foreign keywords. I can read Russian, a little French, and my wife Thai, so we've verified it works very good for those languages. I assume it' s the same for all languages.