fix(bisaya-course): update alternatives for transformation exercise

- Modified the alternatives for a transformation exercise to include additional variations, enhancing the response options for learners.
- Updated the vocabulary service to incorporate both primary and alternative answers, improving the accuracy of answer validation during exercises.

backend/scripts/create-bisaya-course-content.js

@@ -2026,7 +2026,7 @@ const BISAYA_EXERCISES = {
       answerData: {
         type: 'transformation',
         correct: 'Karon',
-        alternatives: ['Karong adlawa']
+        alternatives: ['Karong adlawa', 'Karong adlawa', 'Karong adlawa.']
       },
       explanation: '"karon" heißt „jetzt/heute“. „karong adlawa“ ist eine betonte Form für „heute“.'
     },