Revert Django Locale Middleware to default once upgraded to 1.8+

Description

Due to bugs in django's Locale middleware ( and ), the locale middleware from Django 1.8 was ported to the platform in https://github.com/edx/edx-platform/pull/8402/commits

When we upgrade to Django 1.8, the django_locale/ folder should be removed, and all imports from django_locale/ should be reverted to being imported from django itself.

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Reporter

Sarina Canelake

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