code: function i18n() {
  				const i18nElement = findChild(libraryAppData, "i18n");
  				if ( i18nElement ) {
  					const i18n = i18nElement._;
  					if ( i18n === "false" ) {
  						return false;
  					} else if ( i18n === "true" ) {
  						return "messagebundle.properties";
  					} else {
  						return i18n;
  					}
  					// log.verbose("  sap.ui5/library/i18n property taken from .library appData: '%s'", library.i18n);
  				} else {
  					if ( libBundle.findResource("messagebundle.properties") != null ) {
  						// log.verbose("  sap.ui5/library/i18n property determined from resources: '%s'", library.i18n);
  						return "messagebundle.properties";
  					} else {
  						return false;
  					}
  				}
  			}
docs: i18n: - from .library/appData/manifest/sap.ui5/library/i18n - from library resources (if "messagebundle.properties" exists)