[MIG][12.0] web_dashboard_tile

- refactor tile category
- improve description
- add legalsylvain as maintainer
- update code and translation

web_dashboard_tile/tests/__init__.py

@@ -1,6 +1 @@
-# -*- coding: utf-8 -*-
-# © 2016 Antonio Espinosa - <antonio.espinosa@tecnativa.com>
-# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
-# flake8: noqa
-
 from . import test_tile