Enhance VocabLessonView with new vocabulary trainer features and improved statistics

- Added functionality for tracking total attempts and success rates in the vocabulary trainer, enhancing user feedback on performance.
- Introduced multiple choice and typing modes for vocabulary practice, allowing users to switch between different learning styles.
- Updated translations in both English and German to include new vocabulary terms and exercise instructions, ensuring consistency across languages.
- Improved UI layout for displaying vocabulary statistics and answer options, enhancing overall user experience.

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

@@ -383,6 +383,13 @@
                 "translateTo": "Übersetze ins Deutsche",
                 "translateFrom": "Übersetze ins Bisaya",
                 "next": "Weiter",
+                "totalAttempts": "Versuche",
+                "successRate": "Erfolgsrate",
+                "modeMultipleChoice": "Multiple Choice",
+                "modeTyping": "Texteingabe",
+                "lessonCompleted": "Lektion abgeschlossen!",
+                "goToNextLesson": "Zur nächsten Lektion wechseln?",
+                "allLessonsCompleted": "Alle Lektionen abgeschlossen!",
                 "startExercises": "Zur Kapitel-Prüfung",
                 "correctAnswer": "Richtige Antwort",
                 "alternatives": "Alternative Antworten"