[1.2.X] Fixed #13726 -- Further refine changes made in r12384 and r13069 for...

[1.2.X] Fixed #13726 -- Further refine changes made in r12384 and r13069 for using non-English source languages in JavaScript translation catalogues. Thanks, Ramiro.

Backport from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14911 bcc190cf-cafb-0310-a4f2-bffc1f526a37