Fixed #5495 -- Made some organization / spelling / grammar changes to...

Fixed #5495 -- Made some organization / spelling / grammar changes to docs/i18n.txt. Thanks, Axis_of_Entropy

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6294 bcc190cf-cafb-0310-a4f2-bffc1f526a37