PLF-5931: i18n of Template Statistics, Application Statistics gadgets

Conflicts:
	exo-gadget-pack/gadget-pack/src/main/webapp/gadgets/Management-and-Monitoring-gadgets/Statistics/Applications.xml
	exo-gadget-pack/gadget-pack/src/main/webapp/gadgets/Management-and-Monitoring-gadgets/Statistics/locale/default.xml
PLF-5931: Update key name