Motions are universal, if she stares or watches you then yea she's interested. Throw her a wink and a smile, those are very universal. If she comes over to talk to you and speaks her language then put your finger on your mouth to stop her mid sentence, put your hand on you chest and say "American" then nod, she will nod back understanding you. Then point at yourself and say your name then point at her, you might have to do this twice. Once she says her name hold your hand out and smile greatly, say her name and shake her hand. Invite her to sit down, open your arm and point at a seat. Play the "how do you say this" game by pointing at things and saying their name, maybe she will catch on. Hell point to her lips and ask her how to say those, jump on your phone and google the word beautiful in her language then say "lips" in her language and follow it with "beautiful" and point at her and smile.
I don't think its difficult at all and suffice it to say that you might not close the deal but lets say you do some kino, learn some new words. Talk to her with your eyes, grab her hand, lead her out the bar, have her name more things as you walk down the the sidewalk, maybe pull her in close and go for the kiss. She'll know good and well whats going on, if she declines. Nod your head, stick out your hand, shake hers, smile and walk away.
It's called "Mirroring" and it's neuroscience and DJ's have been doing it for a LONG time.
http://www.cuttingedgepr.com/articles/mirroring-body-language-build-rapport.asp
You really have to think about back in the day when we did not have all this technology when we were going to other countries to make allies. Kissing, hugging, sex is universal and when two people want it enough then that is what making the moves are for.
But regardless it would be fun to try.