feat(TrainingCancellation): enhance cancellation functionality and localization support

- Updated the training cancellation controller to accept training group IDs, improving the cancellation process.
- Modified the database schema to include a JSON field for training group IDs in the training cancellations table.
- Enhanced the TrainingCancellation model to support the new training group IDs field.
- Updated the training cancellation service to normalize and handle training group IDs effectively.
- Added localization support for training cancellation features across multiple languages, improving user experience.

backend/models/TrainingCancellation.js

@@ -36,6 +36,11 @@ const TrainingCancellation = sequelize.define('TrainingCancellation', {
     type: DataTypes.STRING(255),
     allowNull: true,
   },
+  trainingGroupIds: {
+    type: DataTypes.JSON,
+    allowNull: true,
+    field: 'training_group_ids',
+  },
 }, {
   tableName: 'training_cancellations',
   underscored: true,