Here's an interesting compilation of how to say "One beer, please!" in 50 languages, courtesy of Etiquette Systems. This should be enough to keep your glass filled no matter where you are.
A few random examples from the list:
Bulgarian: Edna beerra, molya!
Chinese: Ching gay woh ee bay pee joh!
Greek: Mee-a beer-a paraka-loh!
Irish: Byohr awoyn, lyeh doh hull!
Yiddish: A beer, zeit a-zoy goot!
See the complete list here.
Found on Twitter. Who says there's nothing useful on Twitter?