There is redundant file in po directory, 'setup-master-bal'. I guess this is remain of bug in 0.3 version of Transifex (not used anymore, seems fixed in current 0.6) or just old mistake of committer. Should be removed. http://git.fedorahosted.org/git/?p=setuptool.git;a=blob;f=po/setup-master-bal;hb=HEAD
is it enough to remove this file or is it needed to rebuild setuptool package?
It's enough to remove it for now, you don't have to rebuild the package in Rawhide to the translation deadline.
fix commited upstream