I'm a native Latvian speaker, always set every UI to English, for many reasons. One is that I started using computers before any mainstream software was availa

I'm a native Latvian speaker, always set every UI to English, for many reasons. One is that I started using computers before any mainstream software was available in Latvian, so I am used to English being the language of all computers. Another major reason is the translations themselves, which take two dramatically different approaches. There are official Latvian translations for computer terms, as suggested by the language academy. These translated terms are very much "designed" - they're decided on at committee meetings and, while linguistically sound, I find many of them very unnatural, and their meaning impossible to guess without learning the term explicitly. I won't bother with examples here as there's probably no Latvian speaker reading this anyway. So using those official terms is one approach, and it's followed by, for instance, Microsoft. The other approach (used by most open-source localizations) uses more natural vocabulary with more English borrowings, and only some of the academically-defined terms. Even if I wanted to use Latvian UIs, I would constantly be looking at two fairly different sets of vocabulary. Of course the translations themselves are also poor and often incomplete, unsurprising for such a small language. Some programs automatically show up in Latvian after installation (thanks to, once again, bad use of regional settings), and I will usually see a Latvian/English mix right away because much of the text isn't translated. I've had the misfortune of briefly using the Latvian UI for Windows XP, and it was full of typos and inconsistencies. But above all, by now it's just a matter of habit. I am as comfortable in English as in my native language, and would have no incentive to use a non-English UI even given a perfect translation.