diff --git a/core/core.php b/core/core.php
index 98858373..c451f19d 100644
--- a/core/core.php
+++ b/core/core.php
@@ -312,7 +312,7 @@ class common
 		}
 
 		// Extraction de la sesion
-		$this->input['_SESSION'] = $_SESSION;
+		// $this->input['_SESSION'] = $_SESSION;
 
 		// Déterminer la langue du contenu du site
 		if (isset($_SESSION['ZWII_CONTENT'])) {
@@ -356,7 +356,7 @@ class common
 				: self::$i18nUI;
 		} else {
 			// Installation
-			self::$i18nUI = $this->getInput('ZWII_UI') ? $this->getInput('ZWII_UI') : 'fr_FR';
+			self::$i18nUI = $_SESSION['ZWII_UI'] ? $_SESSION['ZWII_UI'] : 'fr_FR';
 		}
 
 
diff --git a/core/module/install/install.php b/core/module/install/install.php
index cbd14589..61ca1e5c 100644
--- a/core/module/install/install.php
+++ b/core/module/install/install.php
@@ -54,8 +54,9 @@ class install extends common
 		// Soumission du formulaire
 		if ($this->isPost()) {
 			$lang = $this->getInput('installLanguage');
-			// Place le cookie pour la suite de  l'installation
-			setcookie('ZWII_UI', $lang, time() + 3600, helper::baseUrl(false, false), '', false, false);
+			// Pour la suite  de l'installation
+			// setcookie('ZWII_UI', $lang, time() + 3600, helper::baseUrl(false, false), '', false, false);
+			$_SESSION['ZWII_UI'] = $this->getInput('installLanguage');
 
 			// Valeurs en sortie
 			$this->addOutput([
@@ -166,7 +167,8 @@ class install extends common
 						$this->initData('page', self::$i18nContent, false);
 						$this->initData('module', self::$i18nContent, false);
 						// Supprime l'installation FR générée par défaut.
-						$this->removeDir(self::DATA_DIR . 'fr_FR');
+						if (is_dir(self::DATA_DIR . 'fr_FR'))
+							$this->removeDir(self::DATA_DIR . 'fr_FR');
 					}
 
 					// Sauvegarder la configuration du Proxy
diff --git a/core/module/install/view/postinstall/postinstall.css b/core/module/install/view/postinstall/postinstall.css
index d7c543b0..ab1171cc 100644
--- a/core/module/install/view/postinstall/postinstall.css
+++ b/core/module/install/view/postinstall/postinstall.css
@@ -1 +1,22 @@
-/* Vide */
\ No newline at end of file
+/**
+ * This file is part of Zwii.
+ *
+ * For full copyright and license information, please see the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @author Rémi Jean <remi.jean@outlook.com>
+ * @copyright Copyright (C) 2008-2018, Rémi Jean
+ * @author Frédéric Tempez <frederic.tempez@outlook.com>
+ * @copyright Copyright (C) 2018-2023, Frédéric Tempez
+ * @license CC Attribution-NonCommercial-NoDerivatives 4.0 International
+ * @link http://zwiicms.fr/
+ */
+
+
+/** NE PAS EFFACER
+* admin.css
+*/
+
+.title {
+    font-weight: bold;
+}
\ No newline at end of file
diff --git a/core/module/install/view/postinstall/postinstall.php b/core/module/install/view/postinstall/postinstall.php
index 6de89690..770b49cd 100644
--- a/core/module/install/view/postinstall/postinstall.php
+++ b/core/module/install/view/postinstall/postinstall.php
@@ -2,71 +2,79 @@
 	<?php echo helper::translate('Renseignez les champs ci-dessous pour finaliser l\'installation.'); ?>
 </p>
 <?php echo template::formOpen('installForm'); ?>
-<h3>
-	<?php echo helper::translate('Compte administrateur'); ?>
-</h3>
-<div>
-	<div class="row">
-		<div class="col12">
-			<?php echo template::text('installId', [
-				'autocomplete' => 'off',
-				'label' => 'Identifiant'
-			]); ?>
-		</div>
-	</div>
-	<div class="row">
-		<div class="col6">
-			<?php echo template::password('installPassword', [
-				'autocomplete' => 'off',
-				'label' => 'Mot de passe'
-			]); ?>
-		</div>
-		<div class="col6">
-			<?php echo template::password('installConfirmPassword', [
-				'autocomplete' => 'off',
-				'label' => 'Confirmation'
-			]); ?>
-		</div>
-	</div>
-	<div class="row">
-		<div class="col12">
-			<?php echo template::mail('installMail', [
-				'autocomplete' => 'off',
-				'label' => 'Adresse électronique'
-			]); ?>
-		</div>
-	</div>
-	<div class="row">
-		<div class="col6">
-			<?php echo template::text('installFirstname', [
-				'autocomplete' => 'off',
-				'label' => 'Prénom'
-			]); ?>
-		</div>
-		<div class="col6">
-			<?php echo template::text('installLastname', [
-				'autocomplete' => 'off',
-				'label' => 'Nom'
-			]); ?>
-		</div>
-	</div>
-</div>
-<ul class="accordion" data-speed="150">
-	<li class="accordion-item">
-		<h3 class="accordion-title">
-			<?php echo '&#9655; ' . helper::translate('Options avancées'); ?>
-		</h3>
-		<div class="accordion-content">
-			<?php if ($this->getUrl(2) === 'fr_FR'): ?>
+<div class="row">
+	<div class="col12">
+		<details open>
+			<summary>
+				<span class="title">
+					<?php echo helper::translate('Compte administrateur'); ?>
+				</span>
+			</summary>
 			<div class="row">
 				<div class="col12">
-					<?php echo template::checkbox('installDefaultData', true, 'Ne pas charger l\'exemple de site (utilisateurs avancés)', [
-						'checked' => false
-					]);
-					?>
+					<?php echo template::text('installId', [
+						'autocomplete' => 'off',
+						'label' => 'Identifiant'
+					]); ?>
 				</div>
 			</div>
-			<?php endif;?>
+			<div class="row">
+				<div class="col6">
+					<?php echo template::password('installPassword', [
+						'autocomplete' => 'off',
+						'label' => 'Mot de passe'
+					]); ?>
+				</div>
+				<div class="col6">
+					<?php echo template::password('installConfirmPassword', [
+						'autocomplete' => 'off',
+						'label' => 'Confirmation'
+					]); ?>
+				</div>
+			</div>
+			<div class="row">
+				<div class="col12">
+					<?php echo template::mail('installMail', [
+						'autocomplete' => 'off',
+						'label' => 'Adresse électronique'
+					]); ?>
+				</div>
+			</div>
+			<div class="row">
+				<div class="col6">
+					<?php echo template::text('installFirstname', [
+						'autocomplete' => 'off',
+						'label' => 'Prénom'
+					]); ?>
+				</div>
+				<div class="col6">
+					<?php echo template::text('installLastname', [
+						'autocomplete' => 'off',
+						'label' => 'Nom'
+					]); ?>
+				</div>
+			</div>
+		</details>
+	</div>
+</div>
+<div class="row">
+	<div class="col12">
+		<details close>
+			<summary>
+				<span class="title">
+					<?php echo helper::translate('Options avancées'); ?>
+				</span>
+			</summary>
+			<?php if ($this->getUrl(2) === 'fr_FR'): ?>
+				<div class="row">
+					<div class="col12">
+						<?php echo template::checkbox('installDefaultData', true, 'Ne pas charger l\'exemple de site (utilisateurs avancés)', [
+							'checked' => false
+						]);
+						?>
+					</div>
+				</div>
+			<?php endif; ?>
 			<div class="row">
 				<div class="col3">
 					<?php echo template::select('installProxyType', $module::$proxyType, [
@@ -95,11 +103,10 @@
 						'value' => $this->getUrl(2)
 					]); ?>
 				</div>
-
 			</div>
-		</div>
-	</li>
-</ul>
+	</div>
+</div>
+</details>
 <div class="row">
 	<div class="col2">
 		<?php echo template::button('installPrevious', [
diff --git a/core/module/translate/translate.php b/core/module/translate/translate.php
index 192f8b8d..ced4bc55 100644
--- a/core/module/translate/translate.php
+++ b/core/module/translate/translate.php
@@ -615,7 +615,7 @@ class translate extends common
 		 * fait partie des lnagues installées
 		 */
 		if (
-			$this->getInput('ZWII_CONTENT') !== $lang
+			$_SESSION['ZWII_CONTENT'] !== $lang
 			&&
 			is_dir(self::DATA_DIR . $lang)
 			&&