Enhance survival sentences exercises and VocabCourseView for improved user experience

- Added multiple choice exercises for common phrases in Bisaya, including questions and explanations to aid learning.
- Introduced a gap fill exercise for completing survival sentences, enhancing interactive learning.
- Updated VocabCourseView to display a button for continuing the current lesson, ensuring smoother navigation.
- Implemented logic to prevent starting lessons without completing previous ones, improving course progression management.

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

@@ -394,6 +394,9 @@
                 "correctAnswer": "Richtige Antwort",
                 "alternatives": "Alternative Antworten",
                 "notStarted": "Nicht begonnen",
+                "continueCurrentLesson": "Zur aktuellen Lektion",
+                "previousLessonRequired": "Bitte schließe zuerst die vorherige Lektion ab",
+                "lessonNumberShort": "#",
                 "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",

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

@@ -394,6 +394,9 @@
                 "correctAnswer": "Correct Answer",
                 "alternatives": "Alternative Answers",
                 "notStarted": "Not Started",
+                "continueCurrentLesson": "Continue Current Lesson",
+                "previousLessonRequired": "Please complete the previous lesson first",
+                "lessonNumberShort": "#",
                 "readingAloudInstruction": "Read the text aloud. Click 'Start Recording' and begin speaking.",
                 "speakingFromMemoryInstruction": "Speak freely from memory. Use the displayed keywords.",
                 "startRecording": "Start Recording",