Could you for each of the files please add copyright notices following this template (as recommended in the GPLv3 license text):
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
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/>.
It's in my view important to add the part "either version 3 of the License, or (at your option) any later version" because the GPL may receive updates in the future that could be important to protect the freedom of users. Without that formulation present you are implicitly giving your scripts a "GPLv3 only" license.
Could you for each of the files please add copyright notices following this template (as recommended in the GPLv3 license text):
It's in my view important to add the part "either version 3 of the License, or (at your option) any later version" because the GPL may receive updates in the future that could be important to protect the freedom of users. Without that formulation present you are implicitly giving your scripts a "GPLv3 only" license.