You can do it manually by removing them with YUM or RPM
First see which ones you have
rpm -qa | grep psa-locale
Then remove all of the ones you dont want
yum remove psa-locale-it-IT-8.6-build86080716.14 psa-locale-de-DE-8.6-build86080805.15 [...]
or
rpm -e psa-locale-it-IT-8.6-build86080716.14 psa-locale-de-DE-8.6-build86080805.15 [...]