plugins/org.eclipse.jst.common.project.facet.ui/src/org/eclipse/jst/common/project/facet/ui/libprov/internal/LegacyLibraryProviderInstallPanel.properties

message = This project is currently configured to use a legacy method for configuring libraries. Switch to one of the other available library types when it is no longer necessary to open this project in previous versions of Eclipse.