I don't think localisation should be forced on anyone, but we had enough people using our software who couldn't speak English that getting it right would have made a lot of people's lives easier. At one place I worked, they even added Cantonese text to a help page to let Cantonese users know how to get support - but all the text on the buttons and links to get to that point was in English!

As developers, we need to build software for our users, and not for ourselves. That means proper localisation, and it means giving users the option of choosing their own language and settings.