diff --git a/calendar-bundle/src/Resources/contao/modules/ModuleEventlist.php b/calendar-bundle/src/Resources/contao/modules/ModuleEventlist.php
index 59614b4d748..9849ee3e8d2 100644
--- a/calendar-bundle/src/Resources/contao/modules/ModuleEventlist.php
+++ b/calendar-bundle/src/Resources/contao/modules/ModuleEventlist.php
@@ -184,8 +184,14 @@ protected function compile()
 						continue;
 					}
 
-					// Skip occurrences in the past but show running events (see #8497)
-					if (($this->cal_hideRunning || $event['repeatEnd']) && $event['end'] < $intStart)
+					// Hide running events
+					if ($this->cal_hideRunning && $event['begin'] < $intStart)
+					{
+						continue;
+					}
+
+					// Skip occurrences in the past
+					if ($event['repeatEnd'] && $event['end'] < $intStart)
 					{
 						continue;
 					}
diff --git a/core-bundle/src/Resources/contao/classes/Backend.php b/core-bundle/src/Resources/contao/classes/Backend.php
index 2c55bea88b7..a2b3dc5faae 100644
--- a/core-bundle/src/Resources/contao/classes/Backend.php
+++ b/core-bundle/src/Resources/contao/classes/Backend.php
@@ -1128,6 +1128,23 @@ public static function getDcaPickerWizard($extras, $table, $field, $inputName)
   </script>';
 	}
 
+	/**
+	 * Return the decoded host name
+	 *
+	 * @return string
+	 */
+	public static function getDecodedHostname()
+	{
+		$host = Environment::get('host');
+
+		if (strncmp($host, 'xn--', 4) === 0)
+		{
+			$host = Idna::decode($host);
+		}
+
+		return $host;
+	}
+
 	/**
 	 * Add the custom layout section references
 	 */
diff --git a/core-bundle/src/Resources/contao/classes/Frontend.php b/core-bundle/src/Resources/contao/classes/Frontend.php
index aa02c98ffae..bee541486a1 100644
--- a/core-bundle/src/Resources/contao/classes/Frontend.php
+++ b/core-bundle/src/Resources/contao/classes/Frontend.php
@@ -308,6 +308,20 @@ public static function getRootPageFromUrl()
 		$logger = System::getContainer()->get('monolog.logger.contao');
 		$accept_language = Environment::get('httpAcceptLanguage');
 
+		// Get the language from the URL if it is not set (see #456)
+		if (!isset($_GET['language']) && Config::get('addLanguageToUrl'))
+		{
+			$arrMatches = array();
+
+			// Get the request without the query string
+			list($strRequest) = explode('?', Environment::get('relativeRequest'), 2);
+
+			if (preg_match('@^([a-z]{2}(-[A-Z]{2})?)/@', $strRequest, $arrMatches))
+			{
+				Input::setGet('language', $arrMatches[1]);
+			}
+		}
+
 		// The language is set in the URL
 		if (!empty($_GET['language']) && Config::get('addLanguageToUrl'))
 		{
diff --git a/core-bundle/src/Resources/contao/controllers/BackendAlerts.php b/core-bundle/src/Resources/contao/controllers/BackendAlerts.php
index 437c5cc2ab1..9093aa85027 100644
--- a/core-bundle/src/Resources/contao/controllers/BackendAlerts.php
+++ b/core-bundle/src/Resources/contao/controllers/BackendAlerts.php
@@ -55,7 +55,7 @@ public function run()
 		$objTemplate->base = Environment::get('base');
 		$objTemplate->language = $GLOBALS['TL_LANGUAGE'];
 		$objTemplate->title = StringUtil::specialchars($GLOBALS['TL_LANG']['MSC']['systemMessages']);
-		$objTemplate->host = Environment::get('host');
+		$objTemplate->host = Backend::getDecodedHostname();
 		$objTemplate->charset = Config::get('characterSet');
 		$objTemplate->messages = Message::generateUnwrapped() . Backend::getSystemMessages();
 		$objTemplate->noMessages = $GLOBALS['TL_LANG']['MSC']['noSystemMessages'];
diff --git a/core-bundle/src/Resources/contao/controllers/BackendConfirm.php b/core-bundle/src/Resources/contao/controllers/BackendConfirm.php
index 001d52df88b..cc5c3e7fc75 100644
--- a/core-bundle/src/Resources/contao/controllers/BackendConfirm.php
+++ b/core-bundle/src/Resources/contao/controllers/BackendConfirm.php
@@ -153,7 +153,7 @@ public function run()
 		$objTemplate->language = $GLOBALS['TL_LANGUAGE'];
 		$objTemplate->h1 = $GLOBALS['TL_LANG']['MSC']['invalidToken'];
 		$objTemplate->title = StringUtil::specialchars($GLOBALS['TL_LANG']['MSC']['invalidToken']);
-		$objTemplate->host = Environment::get('host');
+		$objTemplate->host = Backend::getDecodedHostname();
 		$objTemplate->charset = Config::get('characterSet');
 
 		return $objTemplate->getResponse();
diff --git a/core-bundle/src/Resources/contao/controllers/BackendFile.php b/core-bundle/src/Resources/contao/controllers/BackendFile.php
index 481b4962adb..c4d0e8c5c6d 100644
--- a/core-bundle/src/Resources/contao/controllers/BackendFile.php
+++ b/core-bundle/src/Resources/contao/controllers/BackendFile.php
@@ -149,7 +149,7 @@ public function run()
 		$objTemplate->base = Environment::get('base');
 		$objTemplate->language = $GLOBALS['TL_LANGUAGE'];
 		$objTemplate->title = StringUtil::specialchars($GLOBALS['TL_LANG']['MSC']['filepicker']);
-		$objTemplate->host = Environment::get('host');
+		$objTemplate->host = Backend::getDecodedHostname();
 		$objTemplate->charset = Config::get('characterSet');
 		$objTemplate->addSearch = true;
 		$objTemplate->search = $GLOBALS['TL_LANG']['MSC']['search'];
diff --git a/core-bundle/src/Resources/contao/controllers/BackendHelp.php b/core-bundle/src/Resources/contao/controllers/BackendHelp.php
index 7ab165f6d5d..60d53606d74 100644
--- a/core-bundle/src/Resources/contao/controllers/BackendHelp.php
+++ b/core-bundle/src/Resources/contao/controllers/BackendHelp.php
@@ -149,7 +149,7 @@ public function run()
 		$objTemplate->base = Environment::get('base');
 		$objTemplate->language = $GLOBALS['TL_LANGUAGE'];
 		$objTemplate->title = StringUtil::specialchars($GLOBALS['TL_LANG']['MSC']['helpWizardTitle']);
-		$objTemplate->host = Environment::get('host');
+		$objTemplate->host = Backend::getDecodedHostname();
 		$objTemplate->charset = Config::get('characterSet');
 		$objTemplate->headline = $arrData['label'][0] ?: $field;
 		$objTemplate->helpWizard = $GLOBALS['TL_LANG']['MSC']['helpWizard'];
diff --git a/core-bundle/src/Resources/contao/controllers/BackendIndex.php b/core-bundle/src/Resources/contao/controllers/BackendIndex.php
index d76f02a7f09..f470ed5854e 100644
--- a/core-bundle/src/Resources/contao/controllers/BackendIndex.php
+++ b/core-bundle/src/Resources/contao/controllers/BackendIndex.php
@@ -100,7 +100,7 @@ public function run()
 		$objTemplate->base = Environment::get('base');
 		$objTemplate->language = $GLOBALS['TL_LANGUAGE'];
 		$objTemplate->languages = System::getLanguages(true); // backwards compatibility
-		$objTemplate->host = Environment::get('host');
+		$objTemplate->host = Backend::getDecodedHostname();
 		$objTemplate->charset = Config::get('characterSet');
 		$objTemplate->userLanguage = $GLOBALS['TL_LANG']['tl_user']['language'][0];
 		$objTemplate->curLanguage = Input::post('language') ?: str_replace('-', '_', $GLOBALS['TL_LANGUAGE']);
diff --git a/core-bundle/src/Resources/contao/controllers/BackendMain.php b/core-bundle/src/Resources/contao/controllers/BackendMain.php
index d7d42939922..847232594cc 100644
--- a/core-bundle/src/Resources/contao/controllers/BackendMain.php
+++ b/core-bundle/src/Resources/contao/controllers/BackendMain.php
@@ -288,7 +288,7 @@ protected function output()
 		$this->Template->base = Environment::get('base');
 		$this->Template->language = $GLOBALS['TL_LANGUAGE'];
 		$this->Template->title = StringUtil::specialchars(strip_tags($this->Template->title));
-		$this->Template->host = Environment::get('host');
+		$this->Template->host = Backend::getDecodedHostname();
 		$this->Template->charset = Config::get('characterSet');
 		$this->Template->account = $GLOBALS['TL_LANG']['MOD']['login'][1];
 		$this->Template->preview = $GLOBALS['TL_LANG']['MSC']['fePreview'];
diff --git a/core-bundle/src/Resources/contao/controllers/BackendPage.php b/core-bundle/src/Resources/contao/controllers/BackendPage.php
index b850b219113..d54563510ec 100644
--- a/core-bundle/src/Resources/contao/controllers/BackendPage.php
+++ b/core-bundle/src/Resources/contao/controllers/BackendPage.php
@@ -139,7 +139,7 @@ public function run()
 		$objTemplate->base = Environment::get('base');
 		$objTemplate->language = $GLOBALS['TL_LANGUAGE'];
 		$objTemplate->title = StringUtil::specialchars($GLOBALS['TL_LANG']['MSC']['pagepicker']);
-		$objTemplate->host = Environment::get('host');
+		$objTemplate->host = Backend::getDecodedHostname();
 		$objTemplate->charset = Config::get('characterSet');
 		$objTemplate->addSearch = true;
 		$objTemplate->search = $GLOBALS['TL_LANG']['MSC']['search'];
diff --git a/core-bundle/src/Resources/contao/controllers/BackendPassword.php b/core-bundle/src/Resources/contao/controllers/BackendPassword.php
index 99f4684986d..64d38c4ae55 100644
--- a/core-bundle/src/Resources/contao/controllers/BackendPassword.php
+++ b/core-bundle/src/Resources/contao/controllers/BackendPassword.php
@@ -130,7 +130,7 @@ public function run()
 		$objTemplate->base = Environment::get('base');
 		$objTemplate->language = $GLOBALS['TL_LANGUAGE'];
 		$objTemplate->title = StringUtil::specialchars($GLOBALS['TL_LANG']['MSC']['pw_new']);
-		$objTemplate->host = Environment::get('host');
+		$objTemplate->host = Backend::getDecodedHostname();
 		$objTemplate->charset = Config::get('characterSet');
 		$objTemplate->action = ampersand(Environment::get('request'));
 		$objTemplate->headline = $GLOBALS['TL_LANG']['MSC']['pw_new'];
diff --git a/core-bundle/src/Resources/contao/controllers/BackendPopup.php b/core-bundle/src/Resources/contao/controllers/BackendPopup.php
index b5c216f402b..3a572440ee5 100644
--- a/core-bundle/src/Resources/contao/controllers/BackendPopup.php
+++ b/core-bundle/src/Resources/contao/controllers/BackendPopup.php
@@ -164,7 +164,7 @@ public function run()
 		$objTemplate->base = Environment::get('base');
 		$objTemplate->language = $GLOBALS['TL_LANGUAGE'];
 		$objTemplate->title = StringUtil::specialchars($this->strFile);
-		$objTemplate->host = Environment::get('host');
+		$objTemplate->host = Backend::getDecodedHostname();
 		$objTemplate->charset = Config::get('characterSet');
 		$objTemplate->labels = (object) $GLOBALS['TL_LANG']['MSC'];
 		$objTemplate->download = StringUtil::specialchars($GLOBALS['TL_LANG']['MSC']['fileDownload']);
diff --git a/core-bundle/src/Resources/contao/controllers/BackendPreview.php b/core-bundle/src/Resources/contao/controllers/BackendPreview.php
index 376a8cef988..667aad9c805 100644
--- a/core-bundle/src/Resources/contao/controllers/BackendPreview.php
+++ b/core-bundle/src/Resources/contao/controllers/BackendPreview.php
@@ -85,7 +85,7 @@ public function run()
 		$objTemplate->base = Environment::get('base');
 		$objTemplate->language = $GLOBALS['TL_LANGUAGE'];
 		$objTemplate->title = StringUtil::specialchars($GLOBALS['TL_LANG']['MSC']['fePreview']);
-		$objTemplate->host = Environment::get('host');
+		$objTemplate->host = Backend::getDecodedHostname();
 		$objTemplate->charset = Config::get('characterSet');
 		$objTemplate->site = Input::get('site', true);
 		$objTemplate->switchHref = $objRouter->generate('contao_backend_switch');
diff --git a/core-bundle/src/Resources/contao/dca/tl_form.php b/core-bundle/src/Resources/contao/dca/tl_form.php
index d35d1cf79d8..92306c2a523 100644
--- a/core-bundle/src/Resources/contao/dca/tl_form.php
+++ b/core-bundle/src/Resources/contao/dca/tl_form.php
@@ -473,7 +473,7 @@ public function generateAlias($varValue, Contao\DataContainer $dc)
 		// Generate an alias if there is none
 		if ($varValue == '')
 		{
-			$varValue = Contao\System::getContainer()->get('contao.slug')->generate($dc->activeRecord->title, $dc->activeRecord->jumpTo, $aliasExists);
+			$varValue = Contao\System::getContainer()->get('contao.slug')->generate($dc->activeRecord->title, Contao\Input::post('jumpTo') ?: $dc->activeRecord->jumpTo, $aliasExists);
 		}
 		elseif ($aliasExists($varValue))
 		{
diff --git a/core-bundle/tests/Functional/RoutingTest.php b/core-bundle/tests/Functional/RoutingTest.php
index a9e7379c94b..59153937c4f 100644
--- a/core-bundle/tests/Functional/RoutingTest.php
+++ b/core-bundle/tests/Functional/RoutingTest.php
@@ -385,7 +385,7 @@ public function getAliasesWithLocale(): \Generator
             '/en/home.xml',
             404,
             '(404 Not Found)',
-            [],
+            ['language' => 'en'],
             'root-with-home.local',
             false,
             false,
@@ -395,7 +395,7 @@ public function getAliasesWithLocale(): \Generator
             '/en/home/auto_item/foo.html',
             404,
             '(404 Not Found)',
-            [],
+            ['language' => 'en'],
             'root-with-home.local',
             false,
             false,
@@ -445,7 +445,7 @@ public function getAliasesWithLocale(): \Generator
             '/en/.html',
             404,
             '(404 Not Found)',
-            [],
+            ['language' => 'en'],
             'root-with-home.local',
             false,
             false,
@@ -495,7 +495,7 @@ public function getAliasesWithLocale(): \Generator
             '/en/home/auto_item/foo.html',
             404,
             '(404 Not Found)',
-            [],
+            ['language' => 'en'],
             'root-with-home.local',
             true,
             false,
@@ -545,7 +545,7 @@ public function getAliasesWithLocale(): \Generator
             '/en/folder/url/home/auto_item/foo.html',
             404,
             '(404 Not Found)',
-            [],
+            ['language' => 'en'],
             'root-with-folder-urls.local',
             true,
             true,