pub fn disable_i18n(mut self) -> Self {
        self.locales = Locales {
            default: "xx-XX".to_string(),
            other: Vec::new(),
            using_i18n: false,
        };
        // All translations manager must implement this function, which is designed for
        // this exact purpose
        #[cfg(engine)]
        {
            self.translations_manager = Tm::Dummy(T::new_dummy());
        }
        self
    }
Explicitly disables internationalization. You shouldn't ever need to
call this, as it's the default, but you may want to if you're writing
middleware that doesn't support i18n.
packages/perseus/src/init.rs