I’ve seen before that this is not followed in certain cases, such as the entire development team being in a specific country where some or many team members don’t know English (well enough). As an anecdote, I’ve seen a team in a large multinational company (US origin) in Spain that used function names, variable names, database table names (and column names), log message text and many other things in Spanish. English was only for the language keywords because that’s what the compiler would accept.