[1.1.X] Fixed #11384 - Make sure translations in the project directory really...

[1.1.X] Fixed #11384 - Make sure translations in the project directory really override translations in apps as specified in the docs.

Backport of r12447.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12609 bcc190cf-cafb-0310-a4f2-bffc1f526a37