You cannot create a path redirect if the alias already exists in for language code (patch supplied)

It looks like you cannot create a path redirect for example/foo/bar with language en-ZA when a page exists at the same path for language en-GB.

The supplied patch modifies the check in the validate function of the "add redirect" form and, if the Locale module is enabled, only prevents creation of a new redirect if one doesn't already exist in the same language.

DANGER! I've tested this and it works on the couple of test cases I've set up, but I haven't had time to thoroughly check it doesn't interfere with path handling - if you apply this patch, please test thoroughly and report any bugs you find back to me.

Thanks!

Al