- [#19518] Implemented the Keycloak "d4science" login parametric template.
- Each new gateway that does not implement its own specific login template should use by default this base "d4science" template. However, it is possible to set some parameters in `<keycloak_home>/themes/<gatewayname>/login/themes.properties` file to do some customizations such as logo, background, colors, and some links (see for example parameters of dev4.d4science.org and next.d4science.org themes).