fix(activity_planner): fix setting of instruction language in activity planner settings

lib/pangea/activity_planner/activity_planner_page.dart

@@ -1,11 +1,6 @@
 import 'dart:math';
 
-import 'package:flutter/material.dart';
-
 import 'package:dropdown_button2/dropdown_button2.dart';
-import 'package:flutter_gen/gen_l10n/l10n.dart';
-import 'package:matrix/matrix.dart';
-
 import 'package:fluffychat/pangea/activity_planner/activity_list_view.dart';
 import 'package:fluffychat/pangea/activity_planner/activity_mode_list_repo.dart';
 import 'package:fluffychat/pangea/activity_planner/activity_plan_request.dart';
@@ -21,6 +16,9 @@ import 'package:fluffychat/pangea/learning_settings/constants/language_constants
 import 'package:fluffychat/pangea/learning_settings/enums/language_level_type_enum.dart';
 import 'package:fluffychat/pangea/learning_settings/widgets/p_language_dropdown.dart';
 import 'package:fluffychat/widgets/matrix.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/l10n.dart';
+import 'package:matrix/matrix.dart';
 
 enum _PageMode {
   settings,
@@ -287,7 +285,7 @@ class ActivityPlannerPageState extends State<ActivityPlannerPage> {
                         languages: MatrixState
                             .pangeaController.pLanguageStore.baseOptions,
                         onChange: (val) =>
-                            _selectedTargetLanguage = val.langCode,
+                            _selectedLanguageOfInstructions = val.langCode,
                         initialLanguage: MatrixState
                             .pangeaController.languageController.userL1,
                         isL2List: false,