feat(vocab): enhance feedback acknowledgment and localization in vocabulary lessons

- Added acknowledgment messages for exercise reinforcement in German, English, and Spanish localization files to improve user guidance.
- Updated VocabLessonView to include a feedback acknowledgment button, enhancing user interaction after answering questions.
- Implemented logic to track feedback acknowledgment state, improving the flow of lesson reviews and user experience.

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

@@ -523,6 +523,8 @@
                 "exerciseWrongTitle": "Noch nicht richtig",
                 "exerciseReinforcementGoPractice": "Zum Üben wechseln",
                 "exerciseReinforcementStay": "Bei der Prüfung bleiben",
+                "exerciseReinforcementGoPracticeAck": "Gelesen, zum Üben wechseln",
+                "exerciseReinforcementStayAck": "Gelesen, bei der Prüfung bleiben",
                 "exerciseStatusOpen": "Offen",
                 "exerciseStatusCorrect": "Erledigt",
                 "exerciseStatusRetry": "Nochmal prüfen",

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

@@ -523,6 +523,8 @@
                 "exerciseWrongTitle": "Not quite right",
                 "exerciseReinforcementGoPractice": "Go to practice",
                 "exerciseReinforcementStay": "Stay on the test",
+                "exerciseReinforcementGoPracticeAck": "Read, go to practice",
+                "exerciseReinforcementStayAck": "Read, stay on the test",
                 "exerciseStatusOpen": "Open",
                 "exerciseStatusCorrect": "Done",
                 "exerciseStatusRetry": "Try again",

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

@@ -521,6 +521,8 @@
                 "exerciseWrongTitle": "Aún no es correcto",
                 "exerciseReinforcementGoPractice": "Ir a practicar",
                 "exerciseReinforcementStay": "Seguir en la prueba",
+                "exerciseReinforcementGoPracticeAck": "Leído, ir a practicar",
+                "exerciseReinforcementStayAck": "Leído, seguir en la prueba",
                 "exerciseStatusOpen": "Pendiente",
                 "exerciseStatusCorrect": "Hecha",
                 "exerciseStatusRetry": "Revisar otra vez",