added missing PPC64LE localization string

fixing
2014-08-12 13:04:47,287 [TP-Processor8] ERROR com.redhat.rhn.common.localization.LocalizationService - *** ERROR: Message with id: [PPC64LE] not found.*** called by com.redhat.rhn.frontend.action.BaseSearchAction.addOption(BaseSearchAction.java:251)
Automatic commit of package [spacewalk-java] release [2.3.20-1].