Update install.rst (django-cms#6610)

torvitas · bplociennik · commit b412969da8f1 · 2019-03-11T15:01:26.000+01:00
change MIDDLEWARE_CLASSES to MIDDLEWARE as cms check expects
diff --git a/docs/how_to/install.rst b/docs/how_to/install.rst
@@ -221,7 +221,7 @@ in the ``TEMPLATES['OPTIONS']['context_processors']``:
 Middleware
 ==========
 
-in your :setting:`django:MIDDLEWARE_CLASSES` you'll need :class:`django:django.middleware.locale.LocaleMiddleware` -
+in your :setting:`django:MIDDLEWARE` you'll need :class:`django:django.middleware.locale.LocaleMiddleware` -
 it's **not** installed in Django projects by default.
 
 Also add::
