Ultimate Member: Custom redirect after registration with auto-approve user based on the current language via WPML plugin

functions.php

function um_custom_registration_redirect( $user_id ) {
	if ( UM()->external_integrations()->is_wpml_active() ) {

		global $sitepress;
		$language_code = $sitepress->get_current_language();

		if ( $language_code == 'fi' ) {
			$redirect_url = 'redirect_url1';
		} else {
			$redirect_url = 'redirect_url2';
		}
		
		exit( wp_redirect( $redirect_url ) );
	}
}
add_action( 'um_registration_after_auto_login', 'um_custom_registration_redirect' );