[keycloak-dev] Custom locales

Hi, I'm not being able to add custom locales in version 1.9.0.final. In previous versions I used to add custom locales files under base/login/messages folder. This behavior has changed in the new version ? I can see that there is an issue related with that for this version https://issues.jboss.org/browse/KEYCLOAK-2237 but I'm not getting there. Any help? Thank you