Enhance exercise generation for family conversations and feelings & affection

- Updated multiple choice exercises to include randomized wrong options for improved engagement and challenge.
- Added new exercise types for reading aloud and speaking from memory, enhancing interactive learning experiences.
- Improved gap fill exercises with clearer instructions and multiple variants for better user understanding.
- Enhanced the vocabulary service to support new exercise types, ensuring robust answer checking and feedback mechanisms.
- Updated localization files to include new instructions and messages related to the new exercise types.

frontend/src/i18n/locales/de/socialnetwork.json

@@ -392,7 +392,20 @@
                 "allLessonsCompleted": "Alle Lektionen abgeschlossen!",
                 "startExercises": "Zur Kapitel-Prüfung",
                 "correctAnswer": "Richtige Antwort",
-                "alternatives": "Alternative Antworten"
+                "alternatives": "Alternative Antworten",
+                "notStarted": "Nicht begonnen",
+                "readingAloudInstruction": "Lies den Text laut vor. Klicke auf 'Aufnahme starten' und beginne zu sprechen.",
+                "speakingFromMemoryInstruction": "Sprich frei aus dem Kopf. Verwende die angezeigten Schlüsselwörter.",
+                "startRecording": "Aufnahme starten",
+                "stopRecording": "Aufnahme stoppen",
+                "startSpeaking": "Sprechen starten",
+                "recording": "Aufnahme läuft",
+                "listening": "Höre zu...",
+                "recordingStopped": "Aufnahme beendet",
+                "recordingError": "Aufnahme-Fehler",
+                "recognizedText": "Erkannter Text",
+                "speechRecognitionNotSupported": "Speech Recognition wird von diesem Browser nicht unterstützt. Bitte verwende Chrome oder Edge.",
+                "keywords": "Schlüsselwörter"
             }
         }
     }