meta: Update copyright info

src/widgets/error_details.rs

@@ -1,3 +1,20 @@
+// Copyright (c) 2024 Sophie Herold
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 use adw::prelude::*;
 use adw::subclass::prelude::*;
 use gtk::CompositeTemplate;

src/widgets/image_page.rs

@@ -1,4 +1,4 @@
-// Copyright (c) 2022-2023 Sophie Herold
+// Copyright (c) 2022-2024 Sophie Herold
 // Copyright (c) 2022 Christopher Davis
 // Copyright (c) 2023 Julian Hofer
 //