feat(bisaya-course): expand 'Haus & Familie' lesson with new vocabulary and exercises

- Added comprehensive learning goals, core patterns, grammar focus, speaking prompts, and practical tasks for the 'Haus & Familie' lesson, enhancing the curriculum for better language acquisition.
- Updated exercise content to include multiple-choice questions and gap-fill tasks related to household vocabulary, improving user engagement and learning outcomes.
- Enhanced localization for the lesson description and vocabulary, ensuring clarity and consistency across the learning platform.

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

@@ -525,6 +525,9 @@
                 "exerciseReinforcementStay": "Stay on the test",
                 "exerciseReinforcementGoPracticeAck": "Read, go to practice",
                 "exerciseReinforcementStayAck": "Read, stay on the test",
+                "exerciseExamFailedTitle": "Minimum score not reached",
+                "exerciseExamFailedBody": "You scored {score}% correct (required: {target}%). Keep practicing in the learning section. After {count} more trainer questions the chapter test unlocks again—you will then retake all questions from the start.",
+                "exerciseExamFailedOk": "OK",
                 "exerciseStatusOpen": "Open",
                 "exerciseStatusCorrect": "Done",
                 "exerciseStatusRetry": "Try again",