[1.1.X] Fixed #11714 - Document a few of the i18n function that can be used...

[1.1.X] Fixed #11714 - Document a few of the i18n function that can be used outside views and templates. Thanks, Jarek Zgoda and Ramiro Morales.

Backport or r12473.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12483 bcc190cf-cafb-0310-a4f2-bffc1f526a37