One really annoying thing about using an English-based UTF8-capable programming language with some types of non-English content (e.g. if it's in Serbian) is that you have to switch between keyboard layouts constantly. Sooner or later you end up forgetting to switch back and you start writing your code in say, Cyrillic. And let me tell you, Cyrillic letter A looks exactly the same as Latin alphabet letter A, but will happily break your javascript in the craziest possible ways, like 2 vars not being the same even though they look exactly the same.
