Set the author name when submitting exercises

lib/providers/add_exercise.dart

@@ -1,3 +1,21 @@
+/*
+ * This file is part of wger Workout Manager <https://github.com/wger-project>.
+ * Copyright (c)  2026 wger Team
+ *
+ * wger Workout Manager is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
 import 'package:logging/logging.dart';
@@ -100,7 +118,7 @@ class AddExerciseProvider with ChangeNotifier {
 
   ExerciseSubmissionApi get exerciseApiObject {
     return ExerciseSubmissionApi(
-      author: '',
+      author: author,
       variation: _variationId,
       variationConnectTo: _variationConnectToExercise,
       category: category!.id,
@@ -110,7 +128,7 @@ class AddExerciseProvider with ChangeNotifier {
       translations: [
         // Base language (English)
         ExerciseTranslationSubmissionApi(
-          author: '',
+          author: author,
           language: languageEn!.id,
           name: exerciseNameEn!,
           description: descriptionEn!,
@@ -123,7 +141,7 @@ class AddExerciseProvider with ChangeNotifier {
         // Optional translation
         if (languageTranslation != null)
           ExerciseTranslationSubmissionApi(
-            author: '',
+            author: author,
             language: languageTranslation!.id,
             name: exerciseNameTrans!,
             description: descriptionTrans!,
@@ -190,8 +208,9 @@ class AddExerciseProvider with ChangeNotifier {
 
       request.files.add(await http.MultipartFile.fromPath('image', image.imageFile.path));
       request.fields['exercise'] = exerciseId.toString();
-      request.fields['license'] = CC_BY_SA_4_ID.toString();
       request.fields['is_main'] = 'false';
+      request.fields['license'] = CC_BY_SA_4_ID.toString();
+      request.fields['license_author'] = author;
 
       final details = image.toJson();
       if (details.isNotEmpty) {