Maybe using Transifex for translations of yum would be a good idea. Please see http://fedoraproject.org/wiki/L10N/Tools/Website#add-transifex
At the current time doing that in yum's git repo is not a good idea. Not opposed for the future - just not right now.
*** Bug 438372 has been marked as a duplicate of this bug. ***
*** Bug 461916 has been marked as a duplicate of this bug. ***