diff --git a/phpmyfaq/admin/api/index.php b/phpmyfaq/admin/api/index.php
index 83d041a826..384691db18 100644
--- a/phpmyfaq/admin/api/index.php
+++ b/phpmyfaq/admin/api/index.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * Private phpMyFAQ Admin API: everything for the online update
+ * Private phpMyFAQ Admin API
  *
  * This Source Code Form is subject to the terms of the Mozilla Public License,
  * v. 2.0. If a copy of the MPL was not distributed with this file, You can
@@ -17,6 +17,7 @@
  */
 
 use phpMyFAQ\Configuration;
+use phpMyFAQ\Language;
 use phpMyFAQ\Translation;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\Request;
@@ -38,6 +39,12 @@
 $response = new JsonResponse();
 $request = Request::createFromGlobals();
 
+//
+// Get language (default: english)
+//
+$language = new Language($faqConfig);
+$currentLanguage = $language->setLanguageByAcceptLanguage();
+
 //
 // Set translation class
 //
@@ -45,7 +52,7 @@
     Translation::create()
         ->setLanguagesDir(PMF_TRANSLATION_DIR)
         ->setDefaultLanguage('en')
-        ->setCurrentLanguage('en') // currently hardcoded
+        ->setCurrentLanguage($currentLanguage)
         ->setMultiByteLanguage();
 } catch (Exception $e) {
     echo '<strong>Error:</strong> ' . $e->getMessage();
diff --git a/phpmyfaq/admin/assets/templates/configuration/upgrade.twig b/phpmyfaq/admin/assets/templates/configuration/upgrade.twig
index 1cdca5369d..35a146b631 100644
--- a/phpmyfaq/admin/assets/templates/configuration/upgrade.twig
+++ b/phpmyfaq/admin/assets/templates/configuration/upgrade.twig
@@ -11,15 +11,15 @@
         <div id="pmf-update-step-health-check" class="card shadow w-100 mb-3">
             <div class="card-body">
                 <h5 class="card-title">
-                    1. Check for System Health
+                    {{ headerCheckHealth }}
                 </h5>
                 <p class="card-text">
-                    This checks the correct file permissions and folder structure of your phpMyFAQ installation.
+                    {{ msgHealthCheck }}
                 </p>
                 <!-- Step 1: Check for system health -->
                 <div class="d-grid gap-2 d-md-flex justify-content-between">
                     <button type="button" class="btn btn-sm btn-primary mb-2" id="pmf-button-check-health">
-                        System health check
+                        {{ buttonCheckHealth }}
                     </button>
                     <output id="result-check-health"></output>
                 </div>
@@ -29,15 +29,15 @@
         <div id="pmf-update-step-check-versions" class="card shadow w-100 mb-3">
             <div class="card-body">
                 <h5 class="card-title">
-                    2. Check for Updates
+                    {{ headerCheckUpdates }}
                 </h5>
                 <p class="card-text">
-                    You can check for new versions of phpMyFAQ, re-install or update your installation.
+                    {{ msgUpdateCheck    }}
                 </p>
                 <!-- Step 2: Check for a new version -->
                 <div class="d-grid gap-2 d-md-flex justify-content-between">
                     <button type="button" class="btn btn-sm btn-primary mb-2" id="pmf-button-check-updates">
-                        Check for a new version
+                        {{ buttonCheckUpdates }}
                     </button>
                     <output id="result-check-versions"></output>
                 </div>
diff --git a/phpmyfaq/admin/upgrade.php b/phpmyfaq/admin/upgrade.php
index 3dffbd5724..760a6d28b8 100644
--- a/phpmyfaq/admin/upgrade.php
+++ b/phpmyfaq/admin/upgrade.php
@@ -37,6 +37,12 @@
 if ($user->perm->hasPermission($user->getUserId(), 'editconfig')) {
     $templateVars = [
         'adminHeaderUpgrade' => Translation::get('ad_menu_upgrade'),
+        'headerCheckHealth' => Translation::get('headerCheckHealth'),
+        'msgHealthCheck' => Translation::get('msgHealthCheck'),
+        'buttonCheckHealth' => Translation::get('buttonCheckHealth'),
+        'headerCheckUpdates' => Translation::get('headerCheckUpdates'),
+        'msgUpdateCheck' => Translation::get('msgUpdateCheck'),
+        'buttonCheckUpdates' => Translation::get('buttonCheckUpdates'),
         'isOnNightlies' => $faqConfig->get('upgrade.releaseEnvironment') === ReleaseType::NIGHTLY->value,
         'releaseEnvironment' => ucfirst($faqConfig->get('upgrade.releaseEnvironment')),
         'dateLastChecked' => $faqConfig->get('upgrade.dateLastChecked')
diff --git a/phpmyfaq/src/phpMyFAQ/Controller/Administration/UpdateController.php b/phpmyfaq/src/phpMyFAQ/Controller/Administration/UpdateController.php
index d2f8167880..692e578aa2 100644
--- a/phpmyfaq/src/phpMyFAQ/Controller/Administration/UpdateController.php
+++ b/phpmyfaq/src/phpMyFAQ/Controller/Administration/UpdateController.php
@@ -225,7 +225,7 @@ public function createTemporaryBackup(): StreamedResponse
         });
     }
 
-    #[Route('admin/api/extract-package')]
+    #[Route('admin/api/install-package')]
     public function installPackage(): StreamedResponse
     {
         $configuration = Configuration::getConfigurationInstance();
diff --git a/phpmyfaq/translations/language_de.php b/phpmyfaq/translations/language_de.php
index 68063b575a..7823469551 100755
--- a/phpmyfaq/translations/language_de.php
+++ b/phpmyfaq/translations/language_de.php
@@ -1332,8 +1332,14 @@
 $PMF_LANG['msgBookmarkRemoved'] = 'Lesezeichen erfolgreich entfernt!';
 
 // added v4.0.0-alpha - 2023-07-11 by Jan
+$PMF_LANG['headerCheckHealth'] = '1. Systemzustand prüfen';
+$PMF_LANG['headerCheckUpdates'] = '2. Suche nach Updates';
+$PMF_LANG['msgHealthCheck'] = 'Dies überprüft die korrekten Dateiberechtigungen und die Ordnerstruktur Ihrer phpMyFAQ-Installation.';
+$PMF_LANG['msgUpdateCheck'] = 'Sie können nach neuen Versionen von phpMyFAQ suchen, neu installieren oder Ihre Installation aktualisieren.';
+$PMF_LANG['buttonCheckHealth'] = 'Systemzustand jetzt prüfen';
+$PMF_LANG['buttonCheckUpdates'] = 'Suche jetzt nach Updates';
 $PMF_LANG['versionIsUpToDate'] = '✅ Deine installierte Version ist aktuell.';
-$PMF_LANG['healthCheckOkay'] = '✅ Deine installierte Version ist gesund.';
+$PMF_LANG['healthCheckOkay'] = '✅ Deine installierte Version ist in Ordnung.';
 $PMF_LANG['downloadSuccessful'] = '✅ Download-Paket erfolgreich heruntergeladen!';
 $PMF_LANG['downloadFailure'] = '❌ Download-Paket konnte nicht heruntergeladen werden';
 $PMF_LANG['verificationFailure'] = '❌ Download-Paket konnte nicht verifiziert werden';
diff --git a/phpmyfaq/translations/language_en.php b/phpmyfaq/translations/language_en.php
index a629ecb407..d6d863552d 100644
--- a/phpmyfaq/translations/language_en.php
+++ b/phpmyfaq/translations/language_en.php
@@ -1351,6 +1351,12 @@
 $PMF_LANG['msgBookmarkRemoved'] = 'Bookmark successfully removed!';
 
 // added v4.0.0-alpha - 2023-07-11 by Jan
+$PMF_LANG['headerCheckHealth'] = '1. Check for System Health';
+$PMF_LANG['headerCheckUpdates'] = '2. Check for Updates';
+$PMF_LANG['msgHealthCheck'] = 'This checks the correct file permissions and folder structure of your phpMyFAQ installation.';
+$PMF_LANG['msgUpdateCheck'] = 'You can check for new versions of phpMyFAQ, re-install or update your installation.';
+$PMF_LANG['buttonCheckHealth'] = 'Check System health now';
+$PMF_LANG['buttonCheckUpdates'] = 'Check for Updates now';
 $PMF_LANG['versionIsUpToDate'] = '✅ Your installed version is up-to-date!';
 $PMF_LANG['healthCheckOkay'] = '✅ Your installed version is healthy!';
 $PMF_LANG['downloadSuccessful'] = '✅ Package successfully downloaded!';