This is a thing that would interest me, too. I currently get some white pages and could narrow it down to users who set a different language than "en".

Regards

that's hardcoded into the core. If you really want to do that find the view for the relevant settings page and comment out the section that shows the language dropdown.

1. Check your language files for BOM (google that for more information)

2. To remove the setting, override the user/settings/language view