Anything that's written/spoken over the PCDs can be garbled into another language (like the translation convention that's going on is going overboard, converting things it doesn't need to, so even people who'd normally speak the same language could end up not understanding one another).

With someone with an auto-understanding gift... they might still be able to /understand/ things, but it might sound pretty odd (like it's all being run through Babelfish). Like getting a really bad gist of it. >.>