In Russia it's considered very bad and novice style to use Russian words as identifiers (they usually spell it with latin letters anyway, constantly switching between latin and cyrillic layouts is very cumbersome). There's one exception: 1C platform, but that software is used internally for accounting and basically a DSL with heavy use of application domain terminology.

Sometimes I'm tempted to use Russian identifiers for application domain terminology, because very often there's no adequate translation or I just don't know English enough to translate some terms. I like the following example: every man here has name combined from last name (Фамилия) which is used for all family members, first name (Имя), that's pretty standard. But there's also third name: Отчество, which is basically father's name with some suffix, e.g. father Иван will have child with third name Иванович. Now I've seen all kinds of translations for those terms, including plain wrong. Last name, family name for Фамилия, first name, name for имя, father name, second name, patronymic, patronymic name for отчество. I've seen bugs because one developer interpreted those terms differently from another.

And that's just for name. There are plenty of other terms. Add to that that many developers are bad at English and at best will use first result from Google Translate. So may be national identifiers have its place.