You can customize the Address Book User Interface either for a specific locale and not under a specific domain and also for a locale under a specific domain.
Create a directory with the locale name (For example, ja under <uwc-deployed-path>/WEB-INF/ui/html/abs)
Copy all files from <uwc-deployed-path>/WEB-INF/ui/html/abs to <uwc-deployed-path>/WEB-INF/ui/html/abs/<locale>
Make the required changes in XSL files as explained in the previous sections.
Create a directory with <domain>/<locale> (For example, siroe.com/ja) under <uwc-deployed-path>/WEB-INF/ui/html
Copy all files from <uwc-deployed-path>/WEB-INF/ui/html/abs to ..../abs/<locale>
Make the required changes in .xsl files as explained in Chapter 7, Customizing General Features in Address Book.