PLF-5930: i18n of Cache Level gadget

Conflicts:
	exo-gadget-pack/gadget-pack/src/main/webapp/gadgets/Management-and-Monitoring-gadgets/Monitoring/Caches.xml
	exo-gadget-pack/gadget-pack/src/main/webapp/gadgets/Management-and-Monitoring-gadgets/Monitoring/locale/default.xml