Adaptions FHC-Alert

- restructure plugins Api, FhcAlert ans Phrasen to use Phrasen in Fhc-Alert
– fix behaviour alert warning: show always clossing cross, and symbol
- fix behaviour alert error: add scrolling to Text MessageError
- phrases alerts

public/js/components/Stv/Studentenverwaltung.js

@@ -192,6 +192,8 @@ export default {
 			.catch(this.$fhcAlert.handleSystemError);
 	},
 	mounted() {
+		//Test manu Systemerror
+		//FHC_JS_DATA_STORAGE_OBJECT.systemerror_mailto = '[email protected]';this.$fhcAlert.handleSystemError(1);
 		if (this.$route.params.id) {
 			this.$refs.stvList.updateUrl(
 				ApiStv.students.uid(this.$route.params.id),