From 9e095ec1c8b738ad5ad0c2d2d5b570bd1ae67bbf Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 6 Dec 2025 21:46:29 +0000
Subject: [PATCH] Use mb_strtoupper with mb_substr for Unicode consistency

Co-authored-by: jbtronics <5410681+jbtronics@users.noreply.github.com>
---
 .../RegisterSynonymsAsTranslationParametersListener.php        | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/EventListener/RegisterSynonymsAsTranslationParametersListener.php b/src/EventListener/RegisterSynonymsAsTranslationParametersListener.php
index 6bc7c949..1495bbaa 100644
--- a/src/EventListener/RegisterSynonymsAsTranslationParametersListener.php
+++ b/src/EventListener/RegisterSynonymsAsTranslationParametersListener.php
@@ -69,7 +69,8 @@ readonly class RegisterSynonymsAsTranslationParametersListener
                 $placeholders['{{' . $elementType->value . '}}'] = mb_strtolower($capitalizedPlural);
 
                 // Square brackets for capitalized versions (with capital first letter in placeholder)
-                $capitalizedKey = ucfirst($elementType->value);
+                // Use mb_strtoupper for the first character to handle multibyte strings consistently
+                $capitalizedKey = mb_strtoupper(mb_substr($elementType->value, 0, 1)) . mb_substr($elementType->value, 1);
                 $placeholders['[' . $capitalizedKey . ']'] = $capitalizedSingular;
                 $placeholders['[[' . $capitalizedKey . ']]'] = $capitalizedPlural;
             }