I don't think testing with a non-US region settings and a non-English language is a huge burden. As a regular user of “internationalised” software, it's really

I don't think testing with a non-US region settings and a non-English language is a huge burden. As a regular user of “internationalised” software, it's really obvious when the people who wrote it do not speak more than one language, or only considered a single-country perspective. Monolinguals, especially those living in the United States, are a minority globally. If you're going to develop all software in the United States, please at least make it work for the rest of us.