diff --git a/src/app/learning/openings/[openingId]/page.tsx b/src/app/learning/openings/[openingId]/page.tsx
index d8a37b8..f699c7f 100644
--- a/src/app/learning/openings/[openingId]/page.tsx
+++ b/src/app/learning/openings/[openingId]/page.tsx
@@ -78,7 +78,7 @@ export default function OpeningTrainingPage() {
             <div className="flex items-center justify-center min-h-[400px]">
               <div className="text-center space-y-4">
                 <div className="w-12 h-12 border-4 border-blue-600 border-t-transparent rounded-full animate-spin mx-auto"></div>
-                <p className="text-gray-600 dark:text-gray-400">Loading opening training session...</p>
+                <p className="text-gray-600 dark:text-gray-400">{t.learning.openingTrainer.loadingSession}</p>
               </div>
             </div>
           </div>
@@ -95,16 +95,16 @@ export default function OpeningTrainingPage() {
           <div className="max-w-6xl mx-auto w-full">
             <div className="text-center py-12">
               <h2 className="text-2xl font-bold text-gray-900 dark:text-white mb-4">
-                Opening Not Found
+                {t.learning.openingTrainer.openingNotFound}
               </h2>
               <p className="text-gray-600 dark:text-gray-400 mb-6">
-                The requested opening could not be found.
+                {t.learning.openingTrainer.openingNotFoundDescription}
               </p>
               <button
                 onClick={() => router.push('/learning/openings')}
                 className="px-6 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors"
               >
-                Back to Opening Selection
+                {t.learning.openingTrainer.backToOpeningSelection}
               </button>
             </div>
           </div>
@@ -125,7 +125,7 @@ export default function OpeningTrainingPage() {
               className="p-2 md:px-4 md:py-2 bg-gray-200 dark:bg-gray-700 rounded-lg hover:bg-gray-300 dark:hover:bg-gray-600 text-sm font-medium transition-colors flex items-center gap-2"
             >
               <ArrowLeft size={20} />
-              <span className="hidden md:inline">Back to Opening Selection</span>
+              <span className="hidden md:inline">{t.learning.openingTrainer.backToOpeningSelection}</span>
             </button>
           </div>
 
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
index 70e04d1..dd18d65 100644
--- a/src/components/Header.tsx
+++ b/src/components/Header.tsx
@@ -1,4 +1,5 @@
 import React from 'react';
+import Link from 'next/link';
 import { useTranslation } from '@/lib/i18n/useTranslation';
 import { SupportedLanguage } from '@/lib/i18n/translations';
 
@@ -14,7 +15,7 @@ export default function Header({ language }: HeaderProps) {
             <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
                 <div className="flex items-center justify-between h-16">
                     {/* App Title/Branding */}
-                    <div className="flex items-center space-x-3">
+                    <Link href="/" className="flex items-center space-x-3 hover:opacity-80 transition-opacity cursor-pointer">
                         <div className="text-2xl">♞</div>
                         <h1 className="text-xl font-semibold text-gray-900 dark:text-white">
                             Chess Tutor
@@ -22,7 +23,7 @@ export default function Header({ language }: HeaderProps) {
                         <span className="hidden sm:inline-block text-sm text-gray-500 dark:text-gray-400">
                             {t.header.tagline}
                         </span>
-                    </div>
+                    </Link>
 
                     {/* Action Buttons */}
                     <div className="flex items-center space-x-3">
diff --git a/src/components/OpeningTrainer/DeviationDialog.tsx b/src/components/OpeningTrainer/DeviationDialog.tsx
index 87ad588..93f32ba 100644
--- a/src/components/OpeningTrainer/DeviationDialog.tsx
+++ b/src/components/OpeningTrainer/DeviationDialog.tsx
@@ -1,11 +1,15 @@
 'use client';
 
+import { useTranslation } from '@/lib/i18n/useTranslation';
+import { SupportedLanguage } from '@/lib/i18n/translations';
+
 interface DeviationDialogProps {
   openingName: string;
   movesCompleted: number;
   onUndo: () => void;
   onStartGame: () => void;
   onContinueExploring?: () => void;
+  language: SupportedLanguage;
 }
 
 export default function DeviationDialog({
@@ -14,18 +18,20 @@ export default function DeviationDialog({
   onUndo,
   onStartGame,
   onContinueExploring,
+  language,
 }: DeviationDialogProps) {
+  const t = useTranslation(language);
   return (
     <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
       <div className="bg-white dark:bg-gray-800 rounded-lg shadow-xl p-8 max-w-md mx-4">
         <div className="text-center mb-6">
           <div className="text-4xl mb-4">🤔</div>
           <h2 className="text-2xl font-bold text-gray-900 dark:text-white mb-2">
-            You've Left the Opening!
+            {t.learning.openingTrainer.deviationTitle}
           </h2>
           <p className="text-gray-600 dark:text-gray-400">
-            You've studied <span className="font-semibold">{movesCompleted}</span> move
-            {movesCompleted !== 1 ? 's' : ''} of the{' '}
+            {t.learning.openingTrainer.deviationMessage} <span className="font-semibold">{movesCompleted}</span>{' '}
+            {movesCompleted !== 1 ? t.learning.openingTrainer.moves : t.learning.openingTrainer.move} of the{' '}
             <span className="font-semibold">{openingName}</span>.
           </p>
           <p className="text-gray-600 dark:text-gray-400 mt-2">
@@ -40,7 +46,7 @@ export default function DeviationDialog({
             className="w-full px-6 py-3 bg-blue-600 text-white rounded-lg hover:bg-blue-700 font-medium transition-colors flex items-center justify-center gap-2"
           >
             <span>♟️</span>
-            <span>Continue Playing (Start Game)</span>
+            <span>{t.learning.openingTrainer.continuePlayingButton}</span>
           </button>
 
           {/* Secondary action: Undo */}
@@ -49,7 +55,7 @@ export default function DeviationDialog({
             className="w-full px-6 py-3 bg-gray-200 dark:bg-gray-700 text-gray-700 dark:text-gray-300 rounded-lg hover:bg-gray-300 dark:hover:bg-gray-600 font-medium transition-colors flex items-center justify-center gap-2"
           >
             <span>↩️</span>
-            <span>Undo & Return to Opening</span>
+            <span>{t.learning.openingTrainer.undoReturnButton}</span>
           </button>
 
           {/* Optional: Continue exploring */}
@@ -59,13 +65,13 @@ export default function DeviationDialog({
               className="w-full px-6 py-3 bg-gray-100 dark:bg-gray-800 text-gray-600 dark:text-gray-400 rounded-lg hover:bg-gray-200 dark:hover:bg-gray-700 font-medium transition-colors border border-gray-300 dark:border-gray-600 flex items-center justify-center gap-2"
             >
               <span>🔍</span>
-              <span>Explore This Variation</span>
+              <span>{t.learning.openingTrainer.exploreVariationButton}</span>
             </button>
           )}
         </div>
 
         <p className="text-xs text-gray-500 dark:text-gray-500 mt-4 text-center">
-          Tip: You can always navigate back using the move history
+          {t.learning.openingTrainer.deviationTip}
         </p>
       </div>
     </div>
diff --git a/src/components/OpeningTrainer/OpeningTrainer.tsx b/src/components/OpeningTrainer/OpeningTrainer.tsx
index 7e063c5..38f3fd0 100644
--- a/src/components/OpeningTrainer/OpeningTrainer.tsx
+++ b/src/components/OpeningTrainer/OpeningTrainer.tsx
@@ -559,6 +559,7 @@ export default function OpeningTrainer({ opening, personality, apiKey, language
         <WikipediaSummary
           openingName={opening.name}
           wikipediaSlug={opening.wikipediaSlug}
+          language={language}
         />
 
         {/* Session info */}
@@ -589,6 +590,7 @@ export default function OpeningTrainer({ opening, personality, apiKey, language
           onUndo={handleUndoDeviation}
           onStartGame={handleStartGameFromPosition}
           onContinueExploring={handleContinueExploring}
+          language={language}
         />
       )}
     </div>
diff --git a/src/components/OpeningTrainer/WikipediaSummary.tsx b/src/components/OpeningTrainer/WikipediaSummary.tsx
index 385443c..07751f9 100644
--- a/src/components/OpeningTrainer/WikipediaSummary.tsx
+++ b/src/components/OpeningTrainer/WikipediaSummary.tsx
@@ -3,16 +3,20 @@
 import { useState, useEffect } from 'react';
 import { WikipediaSummary as WikipediaSummaryType } from '@/types/openingTraining';
 import { getWikipediaSummary } from '@/lib/openingTrainer/wikipediaService';
+import { useTranslation } from '@/lib/i18n/useTranslation';
+import { SupportedLanguage } from '@/lib/i18n/translations';
 
 interface WikipediaSummaryProps {
   openingName: string;
   wikipediaSlug?: string; // Preferred: direct slug from database
+  language: SupportedLanguage;
 }
 
-export default function WikipediaSummary({ openingName, wikipediaSlug }: WikipediaSummaryProps) {
+export default function WikipediaSummary({ openingName, wikipediaSlug, language }: WikipediaSummaryProps) {
   const [summary, setSummary] = useState<WikipediaSummaryType | null>(null);
   const [isLoading, setIsLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
+  const t = useTranslation(language);
 
   useEffect(() => {
     fetchSummary();
@@ -46,7 +50,7 @@ export default function WikipediaSummary({ openingName, wikipediaSlug }: Wikiped
       <div className="bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800 rounded-lg p-4">
         <div className="flex items-center space-x-2">
           <div className="w-4 h-4 border-2 border-blue-600 dark:border-blue-400 border-t-transparent rounded-full animate-spin"></div>
-          <p className="text-sm text-blue-800 dark:text-blue-300">Loading opening background...</p>
+          <p className="text-sm text-blue-800 dark:text-blue-300">{t.learning.openingTrainer.loadingBackground}</p>
         </div>
       </div>
     );
@@ -56,7 +60,7 @@ export default function WikipediaSummary({ openingName, wikipediaSlug }: Wikiped
     return (
       <div className="bg-gray-50 dark:bg-gray-800 border border-gray-200 dark:border-gray-700 rounded-lg p-4">
         <p className="text-sm text-gray-600 dark:text-gray-400">
-          No background information available for this opening.
+          {t.learning.openingTrainer.noBackgroundInfo}
         </p>
       </div>
     );
@@ -77,7 +81,7 @@ export default function WikipediaSummary({ openingName, wikipediaSlug }: Wikiped
       </div>
       <p className="text-sm text-gray-700 dark:text-gray-300 leading-relaxed">{summary.extract}</p>
       <p className="text-xs text-gray-500 dark:text-gray-400">
-        Source: Wikipedia (cached {new Date(summary.fetchedAt).toLocaleDateString()})
+        {t.learning.openingTrainer.wikipediaSource} {new Date(summary.fetchedAt).toLocaleDateString()})
       </p>
     </div>
   );
diff --git a/src/lib/i18n/translations.ts b/src/lib/i18n/translations.ts
index 8b1b759..ffb013e 100644
--- a/src/lib/i18n/translations.ts
+++ b/src/lib/i18n/translations.ts
@@ -215,6 +215,23 @@ export interface Translations {
             backToLearning: string;
             findTheMove: string;
         };
+        openingTrainer: {
+            loadingSession: string;
+            openingNotFound: string;
+            openingNotFoundDescription: string;
+            backToOpeningSelection: string;
+            loadingBackground: string;
+            noBackgroundInfo: string;
+            wikipediaSource: string;
+            deviationTitle: string;
+            deviationMessage: string;
+            deviationTip: string;
+            continuePlayingButton: string;
+            undoReturnButton: string;
+            exploreVariationButton: string;
+            move: string;
+            moves: string;
+        };
     };
 }
 
@@ -419,6 +436,23 @@ const en: Translations = {
             backToLearning: 'Back to Learning Area',
             findTheMove: 'Find the move that creates a',
         },
+        openingTrainer: {
+            loadingSession: 'Loading opening training session...',
+            openingNotFound: 'Opening Not Found',
+            openingNotFoundDescription: 'The requested opening could not be found.',
+            backToOpeningSelection: 'Back to Opening Selection',
+            loadingBackground: 'Loading opening background...',
+            noBackgroundInfo: 'No background information available for this opening.',
+            wikipediaSource: 'Source: Wikipedia (cached',
+            deviationTitle: "You've Left the Opening!",
+            deviationMessage: "You've studied",
+            deviationTip: 'Tip: You can always navigate back using the move history',
+            continuePlayingButton: 'Continue Playing (Start Game)',
+            undoReturnButton: 'Undo & Return to Opening',
+            exploreVariationButton: 'Explore This Variation',
+            move: 'move',
+            moves: 'moves',
+        },
     },
 };
 
@@ -623,6 +657,23 @@ const de: Translations = {
             backToLearning: 'Zurück zum Lernbereich',
             findTheMove: 'Finde den Zug, der eine',
         },
+        openingTrainer: {
+            loadingSession: 'Lade Eröffnungstraining...',
+            openingNotFound: 'Eröffnung nicht gefunden',
+            openingNotFoundDescription: 'Die angeforderte Eröffnung konnte nicht gefunden werden.',
+            backToOpeningSelection: 'Zurück zur Eröffnungsauswahl',
+            loadingBackground: 'Lade Eröffnungshintergrund...',
+            noBackgroundInfo: 'Keine Hintergrundinformationen für diese Eröffnung verfügbar.',
+            wikipediaSource: 'Quelle: Wikipedia (zwischengespeichert',
+            deviationTitle: 'Du hast die Eröffnung verlassen!',
+            deviationMessage: 'Du hast',
+            deviationTip: 'Tipp: Du kannst jederzeit über die Zughistorie zurücknavigieren',
+            continuePlayingButton: 'Weiterspielen (Spiel starten)',
+            undoReturnButton: 'Rückgängig & zur Eröffnung zurück',
+            exploreVariationButton: 'Diese Variante erkunden',
+            move: 'Zug',
+            moves: 'Züge',
+        },
     },
 };
 
@@ -827,6 +878,23 @@ const fr: Translations = {
             backToLearning: 'Retour à la zone d\'apprentissage',
             findTheMove: 'Trouvez le coup qui crée un',
         },
+        openingTrainer: {
+            loadingSession: 'Chargement de la session d\'entraînement...',
+            openingNotFound: 'Ouverture non trouvée',
+            openingNotFoundDescription: 'L\'ouverture demandée n\'a pas pu être trouvée.',
+            backToOpeningSelection: 'Retour à la sélection d\'ouverture',
+            loadingBackground: 'Chargement des informations sur l\'ouverture...',
+            noBackgroundInfo: 'Aucune information disponible pour cette ouverture.',
+            wikipediaSource: 'Source : Wikipédia (en cache',
+            deviationTitle: 'Vous avez quitté l\'ouverture !',
+            deviationMessage: 'Vous avez étudié',
+            deviationTip: 'Astuce : Vous pouvez toujours revenir en arrière en utilisant l\'historique des coups',
+            continuePlayingButton: 'Continuer à jouer (Démarrer la partie)',
+            undoReturnButton: 'Annuler et retourner à l\'ouverture',
+            exploreVariationButton: 'Explorer cette variante',
+            move: 'coup',
+            moves: 'coups',
+        },
     },
 };
 
@@ -1031,6 +1099,23 @@ const it: Translations = {
             backToLearning: 'Torna all\'area di apprendimento',
             findTheMove: 'Trova la mossa che crea un',
         },
+        openingTrainer: {
+            loadingSession: 'Caricamento sessione di allenamento...',
+            openingNotFound: 'Apertura non trovata',
+            openingNotFoundDescription: 'L\'apertura richiesta non è stata trovata.',
+            backToOpeningSelection: 'Torna alla selezione delle aperture',
+            loadingBackground: 'Caricamento informazioni sull\'apertura...',
+            noBackgroundInfo: 'Nessuna informazione disponibile per questa apertura.',
+            wikipediaSource: 'Fonte: Wikipedia (in cache',
+            deviationTitle: 'Hai lasciato l\'apertura!',
+            deviationMessage: 'Hai studiato',
+            deviationTip: 'Suggerimento: Puoi sempre tornare indietro usando la cronologia delle mosse',
+            continuePlayingButton: 'Continua a giocare (Inizia partita)',
+            undoReturnButton: 'Annulla e torna all\'apertura',
+            exploreVariationButton: 'Esplora questa variante',
+            move: 'mossa',
+            moves: 'mosse',
+        },
     },
 };
 
@@ -1235,6 +1320,23 @@ const pl: Translations = {
             backToLearning: 'Powrót do strefy nauki',
             findTheMove: 'Znajdź ruch, który tworzy',
         },
+        openingTrainer: {
+            loadingSession: 'Ładowanie sesji treningowej...',
+            openingNotFound: 'Nie znaleziono otwarcia',
+            openingNotFoundDescription: 'Żądane otwarcie nie zostało znalezione.',
+            backToOpeningSelection: 'Powrót do wyboru otwarcia',
+            loadingBackground: 'Ładowanie informacji o otwarciu...',
+            noBackgroundInfo: 'Brak informacji o tym otwarciu.',
+            wikipediaSource: 'Źródło: Wikipedia (w pamięci podręcznej',
+            deviationTitle: 'Opuściłeś otwarcie!',
+            deviationMessage: 'Przestudiowałeś',
+            deviationTip: 'Wskazówka: Zawsze możesz wrócić używając historii ruchów',
+            continuePlayingButton: 'Kontynuuj grę (Rozpocznij partię)',
+            undoReturnButton: 'Cofnij i wróć do otwarcia',
+            exploreVariationButton: 'Zbadaj tę wariant',
+            move: 'ruch',
+            moves: 'ruchy',
+        },
     },
 };