I'm Polish and I have worked on a project with a very specific locally oriented domain (politics and administration) a few years ago, and I must say that we tri

I'm Polish and I have worked on a project with a very specific locally oriented domain (politics and administration) a few years ago, and I must say that we tried to do it in English and abandoned the idea after a few hours during the design phase. It was just counter-intuitive to translate every institution name and process to English, even though we all were fluent with the language. Not all of the terminology can be translated 1:1, and we'd have to look up not only the words, but even definitions of the respective English term to make sure it's applicable, constantly check how various related entities' names translate, etc. And all of this for nothing, it would be useless abroad anyway! Huge waste of time and brain resources. We ended up coding in Polish. One serious downside: after working on such a project for months, you get to the next one and start coding it in Polish - ugh.