From 8d03973da4571ad30a0660cf1da457649f3c8386 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 7 Nov 2026 17:44:21 +0000
Subject: [PATCH 1/2] Initial plan


From 3b992a8466c1bb4e32e361d218568749d92b9d87 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 7 Nov 2026 17:45:21 +0000
Subject: [PATCH 2/2] Fix language-only normalization output

Co-authored-by: asika32764 <1639206+asika32764@users.noreply.github.com>
---
 packages/language/src/LanguageNormalizer.php     | 2 +-
 packages/language/test/LanguageNormalizeTest.php | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/language/src/LanguageNormalizer.php b/packages/language/src/LanguageNormalizer.php
index a19fdd170..5b524caf0 100644
--- a/packages/language/src/LanguageNormalizer.php
+++ b/packages/language/src/LanguageNormalizer.php
@@ -42,7 +42,7 @@ public static function normalizeLangCode(string $lang, string $sep = '-'): strin
 
         $a = strtolower($a);
 
-        return implode($sep, [$a, $b]);
+        return $b === '' ? $a : implode($sep, [$a, $b]);
     }
 
     public static function sanitize(string $string): string
diff --git a/packages/language/test/LanguageNormalizeTest.php b/packages/language/test/LanguageNormalizeTest.php
index f40b405d8..6053da244 100644
--- a/packages/language/test/LanguageNormalizeTest.php
+++ b/packages/language/test/LanguageNormalizeTest.php
@@ -72,7 +72,7 @@ public function toISO15897UsesUnderscoreSeparator(): void
     #[Test]
     public function normalizeLangCodeKeepsLanguageOnlyCodeWithoutRegion(): void
     {
-        self::assertEquals('en-', LanguageNormalizer::normalizeLangCode('EN'));
+        self::assertEquals('en', LanguageNormalizer::normalizeLangCode('EN'));
     }
 
     #[Test]