Redmine - Feature #23980: Replace icon images with Tabler SVG icons

Mizuki ISHIKAWA wrote in #note-76:

Marius BĂLTEANU

The Material Symbols license is the Apache License v2, which seems to be incompatible with GPLv2. I'm not very familiar with licensing, so is it okay to use Material Symbols in Redmine? Alternatively, would adding a license notice make it possible to use them?

reference:

• https://developers.google.com/fonts/docs/material_symbols?hl=en#licensing
• https://github.com/redmine/redmine/blob/master/LICENSE.txt#L5
• https://en.wikipedia.org/wiki/Apache_License#Compatibility

The LICENSE.txt file in the repository states following:

Redmine - project management software
Copyright (C) Jean-Philippe Lang

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 2
of the License, or (at your option) any later version.
...

The any later version part, so my understanding, makes it possible to relicense the code under the GPLv3 which seems to be compatible with the Apache Licene v2.
I'm not sure if it's necessary to consequently change the license of Redmine to GPLv3 in this case.
https://joinup.ec.europa.eu/licence/gnu-general-public-license-v20-or-later