OO-1747: show a message if someone try the self registration on a system where...

OO-1747: show a message if someone try the self registration on a system where it is disabled instead of a red screen, beautify the error and warning panel

src/main/java/org/olat/core/gui/control/generic/messages/_content/guimsgerror.html

-<div id="o_msg_error" class="panel-danger">
+<div id="o_msg_error" class="panel panel-danger">
  <div class="panel-heading">$r.translate("error.header")</div>
   <div class="panel-body">$message</div>
 </div>
\ No newline at end of file

src/main/java/org/olat/core/gui/control/generic/messages/_content/guimsgwarn.html

-<div id="o_msg_warn" class="panel-warning">
+<div id="o_msg_warn" class="panel panel-warning">
  <div class="panel-heading">$r.translate("warn.header")</div>
   <div class="panel-body">$message</div>
 </div>
\ No newline at end of file

src/main/java/org/olat/registration/RegistrationController.java

@@ -51,6 +51,8 @@ import org.olat.core.gui.control.Event;
 import org.olat.core.gui.control.WindowControl;
 import org.olat.core.gui.control.controller.BasicController;
 import org.olat.core.gui.control.generic.dtabs.Activateable2;
+import org.olat.core.gui.control.generic.messages.MessageController;
+import org.olat.core.gui.control.generic.messages.MessageUIFactory;
 import org.olat.core.gui.control.generic.wizard.WizardInfoController;
 import org.olat.core.gui.media.RedirectMediaResource;
 import org.olat.core.helpers.Settings;
@@ -59,7 +61,6 @@ import org.olat.core.id.Preferences;
 import org.olat.core.id.User;
 import org.olat.core.id.context.ContextEntry;
 import org.olat.core.id.context.StateEntry;
-import org.olat.core.logging.OLATRuntimeException;
 import org.olat.core.util.StringHelper;
 import org.olat.core.util.Util;
 import org.olat.core.util.WebappHelper;
@@ -106,9 +107,14 @@ public class RegistrationController extends BasicController implements Activatea
 	 */
 	public RegistrationController(UserRequest ureq, WindowControl wControl) {
 		super(ureq, wControl);		
-		if (!CoreSpringFactory.getImpl(RegistrationModule.class).isSelfRegistrationEnabled()) { 
-			throw new OLATRuntimeException(RegistrationController.class,
-				"Registration controller launched but self registration is turned off in the config file", null);
+		if (!CoreSpringFactory.getImpl(RegistrationModule.class).isSelfRegistrationEnabled()) {
+			String contact = WebappHelper.getMailConfig("mailSupport");
+			String text = translate("reg.error.disabled.body", new String[]{ contact });
+			MessageController msg = MessageUIFactory.createWarnMessage(ureq, getWindowControl(), null, text);
+			LayoutMain3ColsController layoutCtr = new LayoutMain3ColsController(ureq, getWindowControl(), null, msg.getInitialComponent(), null);
+			listenTo(layoutCtr);
+			putInitialPanel(layoutCtr.getInitialComponent());
+			return;
 		}
 		// override language when not the same as in ureq and add fallback to
 		// property handler translator for user properties

src/main/java/org/olat/registration/_i18n/LocalStrings_de.properties

@@ -71,6 +71,7 @@ reg.notiEmail.body=Soeben hat sich ein neuer Benutzer in OpenOLAT registriert\:
 reg.notiEmail.subject=Neuer OpenOLAT-Benutzer\: {1} {2} ({0})
 reg.subject=Registrierungsschl\u00FCssel f\u00FCr OpenOLAT
 reg.wherefrom=Diese Anfrage an den Server {0} wurde am {1} \nvon der IP-Adresse {2} abgeschickt.
+reg.error.disabled.body=Die Selbstregistrierung wurde für dieses System deaktiviert. Bitte kontaktieren Sie den zuständigen Systemadministrator unter {0} um einen Zugang zu erhalten. 
 reg.error.title=Registrierung abgebrochen
 reg.error.no_username=Kein Benutzername konnte erstellt werden
 reg.error.user_in_use=Benutzername ist schon besetzt

src/main/java/org/olat/registration/_i18n/LocalStrings_en.properties

@@ -68,6 +68,7 @@ pwform.cancelled=OpenOLAT password change was cancelled. Password remains unchan
 pwform.failed=An unexpected server error occurred. Your password was not altered.
 pwkey.missingentry=Key for OpenOLAT password change not found.
 reg.body=Thank you for your interest in OpenOLAT.\r\n\r\nPlease use the link {0}/dmz/registration/index.html?key\={1}&language\={2} \r\nto complete your registration.\r\n\r\nIn case you do not want to register, just ignore this e-mail.\r\n\r\nYour OpenOLAT team
+reg.error.disabled.body=The self registration for this system has been disabled. Please contact the system administrator ({0}) in order to gain access. 
 reg.error.no_username=User name could not be created
 reg.error.title=Registration cancelled
 reg.error.user_in_use=This user name already exists