Added note about CacheMiddleware to docs/i18n.txt.
Added note about CacheMiddleware to docs/i18n.txt.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%401117

Belgabor/django,adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel,Belgabor/django,Belgabor/django