diff --git a/frontend/src/app/dashboard/glossaries/[id]/page.tsx b/frontend/src/app/dashboard/glossaries/[id]/page.tsx
index 3a1ef55..322a41c 100644
--- a/frontend/src/app/dashboard/glossaries/[id]/page.tsx
+++ b/frontend/src/app/dashboard/glossaries/[id]/page.tsx
@@ -41,9 +41,11 @@ function getDisplaySource(
   glossarySourceLang: string
 ): string {
   if (!lang || lang === 'multi') return '';
-  if (lang === glossarySourceLang) return term.source;
+  const normalizedLang = lang.toLowerCase();
+  const normalizedSourceLang = glossarySourceLang.toLowerCase();
+  if (normalizedLang === normalizedSourceLang) return term.source;
   const translations = term.translations || {};
-  return translations[lang] || '';
+  return translations[normalizedLang] || '';
 }
 
 /** Target term in the chosen language.
@@ -54,9 +56,11 @@ function getDisplayTarget(
   glossaryTargetLang: string
 ): string {
   if (!lang) return '';
-  if (lang === 'multi' || lang === glossaryTargetLang) return term.target;
+  const normalizedLang = lang.toLowerCase();
+  const normalizedTargetLang = glossaryTargetLang.toLowerCase();
+  if (normalizedLang === 'multi' || normalizedLang === normalizedTargetLang) return term.target;
   const translations = term.translations || {};
-  return translations[lang] || '';
+  return translations[normalizedLang] || '';
 }
 
 export default function GlossaryDetailPage() {