Removed LocaleMiddleware from settings template.
It was added in 3f1c7b7. Single language sites should always be translated in LANGUAGE_CODE, regardless of the browser's Accept-Language. Having LocaleMiddleware enabled can result in having some parts, like the admin, translated in an unexpected language, typically if someone browses a non-English website on a system set up in English. Since most websites won't be translated in multiple languages — especially at the time they're created — it's better not to enable LocaleMiddleware by default. Thanks Ramiro for the feedback.