I've recently switched to 1.5, mostly because of sparse checkouts. I just spotted every-time I commit something Subversion bundle shows "unknown revision committed" in the title, which is obviously because now "svn" command has Polish (my native language) locale and doesn't output "Commited revision XX." but the text in Polish.
I'd suggest to set "LANG=en_US" environment variable before launching any command that matches the output text in English or when running command line directly use "LANG=en_US svn" instead of just "svn". This suggestion should go also to all other bundle creators that use similar methods.
Best regards,