Fix

lib/SimpleSAML/Locale/Localization.php

@@ -251,7 +251,7 @@ class Localization
 
         $file = new File($langPath . $domain . '.po');
         if ($this->fileSystem->exists($file->getRealPath()) && $file->isReadable()) {
-            $translations = (new PoLoader())->loadFile($file);
+            $translations = (new PoLoader())->loadFile($file->getRealPath());
             $arrayGenerator = new ArrayGenerator();
             $this->translator->addTranslations(
                 $arrayGenerator->generateArray($translations)

lib/SimpleSAML/Locale/Translate.php

@@ -11,6 +11,7 @@ declare(strict_types=1);
 namespace SimpleSAML\Locale;
 
 use Gettext\Translator;
+use Gettext\TranslatorFunctions;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\Configuration;
 use SimpleSAML\Logger;
@@ -81,8 +82,7 @@ class Translate
         // This may happen if you forget to set a variable and then run undefinedVar through the trans-filter
         $original = $original ?? 'undefined variable';
 
-        $loc = new Localization(Configuration::getInstance());
-        $text = $loc->getTranslator()->gettext($original);
+        $text = TranslatorFunctions::getTranslator()->gettext($original);
 
         if (func_num_args() === 1) {
             return $text;
@@ -108,8 +108,7 @@ class Translate
         // This may happen if you forget to set a variable and then run undefinedVar through the trans-filter
         $original = $original ?? 'undefined variable';
 
-        $loc = new Localization(Configuration::getInstance());
-        $text = $loc->getTranslator()->ngettext($original, $plural, $value);
+        $text = TranslatorFunctions::getTranslator()->ngettext($original, $plural, $value);
 
         if (func_num_args() === 3) {
             return $text;