Do you SEO guys thinks one could benefit from adding multiple translations in the keyword tag ? Eg: games, jeux, spiele, ... but your overall content would be english. Your thoughts please .
Why would you want to do that? Unless you actually have pages in those languages there's zero seo benefit imo. If people are searching in a different language, they want pages in that language - and you'll be out ranked by sites that are in that language.
I don't think it will help you. Most of all, meta keyword tag is almost useless now, so spend your time on more important SEO part.