[keycloak-user] Themeing: Set Urls + Locale

Hello everyone, is there a clean way to set the registrationUrl, loginUpdateProfileUrl, loginResetCredentialsUrl to my own one based on the Redirect URI as well as sending a Locale to the Keycloak pages which to be used instead of the configured default? I'm using the Spring Security Adapter and I'm also familiar in creating Service Provider. I need to do the registration, password forgotten and update profile processes within my webapp as there are some post-processes to be done and I don't want to rewrite them. That's no problem as I'm using a User Storage Provider. The Redirect URI looks like https://localhost:8443/de_DE/login.html The Registration page is accessible through https://localhost:8443/de_DE/register.html The Password forgotten page is accessible through https://localhost:8443/de_DE/pwreminder.html The Update Profile page is accessible through https://localhost:8443/de_DE/myaccount.html The hackish way would be to get the Query Parameter "redirect_uri" in the ftl Template and build the base url "https://localhost:8443/de_DE". But then the Template still uses the default Locale. Are there any clean ways?