feat(vocab): enhance vocabulary exercises and localization support

- Updated core patterns in BISAYA_PHASE5_DIDACTICS to include gloss translations for better understanding.
- Refactored vocabulary exercise generation in update-food-care-exercises.js to improve randomization and user engagement.
- Added new exercise types and improved question structures for vocabulary lessons, enhancing the learning experience.
- Enhanced localization files for German, English, and Spanish to support new exercise features and improve user guidance.
- Updated VocabLessonView to incorporate sequential navigation for exercises, providing a more structured learning flow.

backend/scripts/bisaya-course-phase5-extension.js

@@ -52,7 +52,12 @@ export const BISAYA_PHASE5_DIDACTICS = {
       'Nahe Bedeutungen in stabilere Antworten überführen.',
       'Häufige Stolperstellen transparent machen.'
     ],
-    corePatterns: ['Palangga taka.', 'Mingaw ko nimo.', 'Magpahuway sa.', 'Andam na ka?']
+    corePatterns: [
+      { target: 'Palangga taka.', gloss: 'Ich hab dich lieb.' },
+      { target: 'Mingaw ko nimo.', gloss: 'Ich vermisse dich.' },
+      { target: 'Magpahuway sa.', gloss: 'Ruh dich aus.' },
+      { target: 'Andam na ka?', gloss: 'Bist du fertig?' }
+    ]
   },
   'Freies Erzählen - Mein Alltag': {
     learningGoals: [

backend/scripts/update-food-care-exercises.js

@@ -652,23 +652,43 @@ async function updateFoodCareExercises() {
           totalExercisesCreated++;
         }
       } else if (lesson.title === 'Essen & Trinken') {
-        // Vokabular-Übungen für "Essen & Trinken"
-        for (const vocab of conversations) {
-          // Multiple Choice: Muttersprache -> Bisaya
+        // Vokabular: keine strikte Paarung Deutsch→Bisaya direkt gefolgt von Rückrichtung (vermeidet Verräter-Effekt).
+        const n = conversations.length;
+        const offset = Math.max(1, Math.floor(n / 2));
+        const revIdx = (i) => (i + offset) % Math.max(n, 1);
+
+        const pickOtherBisaya = (correct, start) => {
+          for (let t = 1; t <= n; t++) {
+            const o = conversations[(start + t) % n]?.bisaya;
+            if (o && o !== correct) return o;
+          }
+          return 'Salamat';
+        };
+        const pickOtherNative = (correct, start) => {
+          for (let t = 1; t <= n; t++) {
+            const o = conversations[(start + t) % n]?.native;
+            if (o && o !== correct) return o;
+          }
+          return 'Danke';
+        };
+
+        for (let i = 0; i < n; i++) {
+          const vocab = conversations[i];
           await VocabGrammarExercise.create({
             lessonId: lesson.id,
-            exerciseTypeId: 2, // multiple_choice
+            exerciseTypeId: 2,
             exerciseNumber: exerciseNumber++,
             title: `Wie sagt man "${vocab.native}"?`,
             instruction: 'Wähle die richtige Übersetzung.',
             questionData: JSON.stringify({
               type: 'multiple_choice',
+              answerLanguage: 'target',
               question: `Wie sagt man "${vocab.native}" auf Bisaya?`,
               options: [
                 vocab.bisaya,
-                conversations[(exerciseNumber - 2 + 1) % conversations.length]?.bisaya || 'Salamat',
-                conversations[(exerciseNumber - 2 + 2) % conversations.length]?.bisaya || 'Maayo',
-                conversations[(exerciseNumber - 2 + 3) % conversations.length]?.bisaya || 'Palihug'
+                pickOtherBisaya(vocab.bisaya, i),
+                pickOtherBisaya(vocab.bisaya, i + 3),
+                pickOtherBisaya(vocab.bisaya, i + 6)
               ]
             }),
             answerData: JSON.stringify({
@@ -679,22 +699,25 @@ async function updateFoodCareExercises() {
             createdByUserId: course.owner_user_id || systemUser.id
           });
           totalExercisesCreated++;
+        }
 
-          // Multiple Choice: Bisaya -> Muttersprache
+        for (let i = 0; i < n; i++) {
+          const vocab = conversations[revIdx(i)];
           await VocabGrammarExercise.create({
             lessonId: lesson.id,
-            exerciseTypeId: 2, // multiple_choice
+            exerciseTypeId: 2,
             exerciseNumber: exerciseNumber++,
             title: `Was bedeutet "${vocab.bisaya}"?`,
             instruction: 'Wähle die richtige Übersetzung.',
             questionData: JSON.stringify({
               type: 'multiple_choice',
+              answerLanguage: 'native',
               question: `Was bedeutet "${vocab.bisaya}"?`,
               options: [
                 vocab.native,
-                conversations[(exerciseNumber - 3 + 1) % conversations.length]?.native || 'Danke',
-                conversations[(exerciseNumber - 3 + 2) % conversations.length]?.native || 'Bitte',
-                conversations[(exerciseNumber - 3 + 3) % conversations.length]?.native || 'Gut'
+                pickOtherNative(vocab.native, i),
+                pickOtherNative(vocab.native, i + 4),
+                pickOtherNative(vocab.native, i + 8)
               ]
             }),
             answerData: JSON.stringify({
@@ -706,6 +729,31 @@ async function updateFoodCareExercises() {
           });
           totalExercisesCreated++;
         }
+
+        for (let i = 0; i < n; i++) {
+          const vocab = conversations[i];
+          await VocabGrammarExercise.create({
+            lessonId: lesson.id,
+            exerciseTypeId: 4,
+            exerciseNumber: exerciseNumber++,
+            title: `Tippe auf Bisaya: "${vocab.native}"`,
+            instruction: 'Übersetze das Wort (Schreibtest).',
+            questionData: JSON.stringify({
+              type: 'transformation',
+              text: vocab.native,
+              sourceLanguage: nativeLangName,
+              targetLanguage: 'Bisaya'
+            }),
+            answerData: JSON.stringify({
+              type: 'transformation',
+              correct: vocab.bisaya,
+              alternatives: []
+            }),
+            explanation: vocab.explanation,
+            createdByUserId: course.owner_user_id || systemUser.id
+          });
+          totalExercisesCreated++;
+        }
       }
     }