Yup, and it could greatly increase the amount of traffic you get to certain hubs. If you check the incoming traffic your getting you will see google.it, google.ca, google.fr, google.co.in etc - There all countries and google rates your articles to those search terms as well.
I have a hub that is number 4 in the serps on Google.com, and on page 3 for the same keyword on Google.fr. Maybe if my tags were in french it could alter that page 3 rating to first page. An example is if it has the term "Plus de sonnaille" as a tag alongside "More Cowbell"