[stingraycharles]

Yeah, it's even worse when people use their native language in code comments or, god forbid, variable names. There suddenly is no way of collaboration with people who aren't familiar with your native language.

[Adirael]

I once inherited an spaghetti PHP project with everything (code, comments and documentation) written in swedish. It was awful.

[walshemj]

Well at one place we had a mix of Portuguese, English and Polish in out comments.

And much longer ago I had to work on a PET BASIC program for a RnD project for BS 5750 (aka ISO 9000) all of the comments where in Gaelic :-)