@Override
        public String getName() { return "allowed-languages"; }
Comma-separated list of all allowed languages, where each language is
represented by a language key, such as "en" or "en_US". If specified,
only languages within this list will be listed as available by the REST
service.
guacamole/src/main/java/org/apache/guacamole/extension/LanguageResourceService.java