I think people are more frustrated by having problems they can't solve.
When the asker speaks Danish and the guy who could write the best answer to that question speaks Turk, everybody loses. Having everybody use English instead, even if it's poor English, is far better.
It's not a matter of technology. It's a matter of audience.
See, if a Q&A site can't get you answers for your questions it has failed. To do so, the Q&A site must connect the asker to as many potential answerers as possible. If there are not enough of those, not enough questions get answered and users won't come back.
The site quickly becomes a ghost town, population: zero. Game over.
If it was merely a technological challenge, StackExchange 1.0 would have worked. And so would ubuntu.shapado.com and ask.debian.net (also running Shapado) have -- instead, they sport respectively a whopping 11 and 21 users who ever gave any answer. I'm not picking on Shapado, mind you -- other platforms, like cnprog, also have this problem.
Compare with Area51, which considers a Q&A site healthy when it has at least 90% answered questions, 1.5k hits per day and 150 avid users (200+ rep).
Disclaimer: I'm a native Italian speaker.