Take the internship because it gives you valuable work experience. But don't make any assumptions, find out what your role would, it might help you make your decision.
While France is nice, you can take international finance anywhere, unless you are planning on a minor in French, not sure how interesting that would be to future employers.
Don't just look at France - -a hot damn, I'm in France -- look ata the program and what it offers,and what you will get out of it both professionally and personally.
Going to France on your own isn't that difficult - planes fly there every day...
This wouldn't be your only opportunity to get there.