Programming is almost always conducted in English, even if the application itself as well internationalized and can be used from different languages. Even API documentation is almost always written in English regardless of the country of origin of the author. The only exception I can see to this rule is programs and docs written in China.

Everywhere else, it's reasonable to assume that if you're a programmer, you speak English and likely have an English keyboard. This may not be fair, but it is the state of affairs.

You likely own a US keyboard not only for the parentheses problem, but because of all sorts of English isms throughout all code -- alphanumerics, urls, etc are all in Latin script. It's like German in the field of mathematics in the 19th century.