feat(bisaya-course): refine phase 4 didactics and enhance course content generation

- Corrected grammatical errors and improved the phrasing in the BISAYA_PHASE4_DIDACTICS, ensuring clarity and accuracy in the learning materials.
- Updated the course content generation script to include lessons from phase 5, enhancing the overall structure and flow of the course.
- Introduced a new vocabulary course content synchronization process, improving the integration of vocabulary resources across different modules.
- Enhanced the VocabService to dynamically adjust temperature settings based on the mode, optimizing response generation for different contexts.
- Added new localized titles and vocabulary entries in multiple languages, enriching the learning experience for users.

backend/scripts/sync-vocab-course-content.js

@@ -31,6 +31,7 @@ const SAFE_SYNC_STEPS = {
     'backend/scripts/create-bisaya-course-content.js'
   ],
   'german-for-bisaya': [
+    'backend/scripts/create-german-for-bisaya-course.js',
     'backend/scripts/extend-german-for-bisaya-course-phase3.js',
     'backend/scripts/extend-german-for-bisaya-course-phase4.js',
     'backend/scripts/extend-german-for-bisaya-course-phase5.js',