feat(bisaya): update instruction for soft refusal exercise for clarity

backend/migrations-active/20260907000002-clarify-bisaya-soft-refusal-gap.cjs

@@ -0,0 +1,19 @@
+'use strict';
+
+module.exports = {
+  async up(queryInterface) {
+    await queryInterface.sequelize.query(`
+      UPDATE community.vocab_grammar_exercise AS exercise
+      SET instruction = 'Lehne eine Einladung höflich ab: „Heute lieber nicht. Ein anderes Mal.“'
+      FROM community.vocab_course_lesson AS lesson
+      WHERE exercise.lesson_id = lesson.id
+        AND lesson.course_id = 1
+        AND lesson.lesson_number = 28
+        AND lesson.title = 'Höflichkeitsformen praktisch'
+        AND exercise.exercise_number = 2
+        AND exercise.title = 'Weich ablehnen';
+    `);
+  },
+
+  async down() {}
+};

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

@@ -1252,7 +1252,7 @@ const BISAYA_EXERCISES = {
     {
       exerciseTypeId: 1,
       title: 'Weich ablehnen',
-      instruction: 'Fülle die Lücken.',
+      instruction: 'Lehne eine Einladung höflich ab: „Heute lieber nicht. Ein anderes Mal.“',
       questionData: {
         type: 'gap_fill',
         text: 'Dili lang sa {gap}. Sunod na {gap}.',