Before this commit button colors were only obtained from one of the predefined styles. After this commit button colors can be specified by using the new "Custom" style. task-2612755 closes odoo/odoo#76461 X-original-commit: a010c91b5ee119cf54ed1a68a6ea06b2bc5f3978 Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com> Signed-off-by: Benoit Socias (bso) <bso-odoo@users.noreply.github.com>