European English for code. It's sufficiently different from American that it's sort of got its own rules at this point. It's difficult to understand sometimes.
Most docs at my >200 dev shop including contractors are in German though.
Based on what I've seen source code is almost exclusively English, apart from a few identifiers here and there that are hard to translate, e.g. legal terms.
Where I’m at, the source code is English even though I’m the only non-German in the company (and I have been learning German for a while). Documentation is a mix of English and German.
