[nemo1618]

Mostly because it has an "ignore comments" mode. A lot of non-English speaking programmers write code using English keywords and identifiers but use their native language in the comments.

With some work, it could be made language-agnostic, but that's more than I have time for right now. If comments aren't an issue, you can just grep through all your source files for the offending characters, which shouldn't take more than a simple bash script.