[gnome-nibbles/arnaudb/modernize-code] Add copyright notices.

[Arnaud B. <arnaudb src gnome org>]

commit d57afab830a21b0c0ed4750350d155026001ee6c
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Jun 1 13:56:34 2020 +0200

    Add copyright notices.

 data/controls-grid.ui      | 19 +++++++++++++++++++
 data/gnome-nibbles.6       |  2 +-
 data/nibbles.ui            | 19 +++++++++++++++++++
 data/player-score-box.ui   | 18 ++++++++++++++++++
 data/preferences-dialog.ui | 18 ++++++++++++++++++
 data/scoreboard.ui         | 18 ++++++++++++++++++
 6 files changed, 93 insertions(+), 1 deletion(-)
---
diff --git a/data/controls-grid.ui b/data/controls-grid.ui
index 93f2be0..4e0a3bb 100644
--- a/data/controls-grid.ui
+++ b/data/controls-grid.ui
@@ -1,3 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+   This file is part of GNOME Nibbles.
+
+   Copyright (C) 2015-2016 Iulian Radu
+
+   GNOME Nibbles 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.
+
+   GNOME Nibbles 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 GNOME Nibbles.  If not, see <https://www.gnu.org/licenses/>.
+-->
 <interface>
   <template class="ControlsGrid" parent="GtkGrid">
     <property name="visible">True</property>
diff --git a/data/gnome-nibbles.6 b/data/gnome-nibbles.6
index d6b80ce..a54d7b2 100644
--- a/data/gnome-nibbles.6
+++ b/data/gnome-nibbles.6
@@ -2,7 +2,7 @@
 .\"
 .\" This is free software; you may redistribute it and/or modify
 .\" it under the terms of the GNU General Public License as
-.\" published by the Free Software Foundation; either version 2,
+.\" published by the Free Software Foundation; either version 3,
 .\" or (at your option) any later version.
 .\"
 .\" This is distributed in the hope that it will be useful, but
diff --git a/data/nibbles.ui b/data/nibbles.ui
index 7baa8b9..3673b72 100644
--- a/data/nibbles.ui
+++ b/data/nibbles.ui
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+   This file is part of GNOME Nibbles.
+
+   Copyright (C) 2015-2016 Iulian Radu
+   Copyright (C) 2020 Arnaud Bonatti
+
+   GNOME Nibbles 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.
+
+   GNOME Nibbles 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 GNOME Nibbles.  If not, see <https://www.gnu.org/licenses/>.
+-->
 <interface>
   <menu id="app-menu">
     <section>
diff --git a/data/player-score-box.ui b/data/player-score-box.ui
index c498000..ddcb00e 100644
--- a/data/player-score-box.ui
+++ b/data/player-score-box.ui
@@ -1,4 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+   This file is part of GNOME Nibbles.
+
+   Copyright (C) 2015 Iulian Radu
+
+   GNOME Nibbles 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.
+
+   GNOME Nibbles 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 GNOME Nibbles.  If not, see <https://www.gnu.org/licenses/>.
+-->
 <interface>
   <template class="PlayerScoreBox" parent="GtkBox">
     <property name="visible">True</property>
diff --git a/data/preferences-dialog.ui b/data/preferences-dialog.ui
index e42e368..93eae2b 100644
--- a/data/preferences-dialog.ui
+++ b/data/preferences-dialog.ui
@@ -1,4 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+   This file is part of GNOME Nibbles.
+
+   Copyright (C) 2015 Gabriel Ivascu
+
+   GNOME Nibbles 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.
+
+   GNOME Nibbles 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 GNOME Nibbles.  If not, see <https://www.gnu.org/licenses/>.
+-->
 <interface>
   <template class="PreferencesDialog" parent="GtkDialog">
     <property name="can_focus">False</property>
diff --git a/data/scoreboard.ui b/data/scoreboard.ui
index 55a937e..5fab999 100644
--- a/data/scoreboard.ui
+++ b/data/scoreboard.ui
@@ -1,4 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+   This file is part of GNOME Nibbles.
+
+   Copyright (C) 2015 Iulian Radu
+
+   GNOME Nibbles 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.
+
+   GNOME Nibbles 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 GNOME Nibbles.  If not, see <https://www.gnu.org/licenses/>.
+-->
 <interface>
   <template class="Scoreboard" parent="GtkBox">
     <property name="orientation">horizontal</property>