public Map<String, Resource> getLanguageResources() {
        return Collections.unmodifiableMap(resources);
    }
Returns a map of all languages currently associated with this service,
where the key of each map entry is the language key. The returned map
cannot be modified.

@return
    A map of all languages currently associated with this service.
guacamole/src/main/java/org/apache/guacamole/extension/LanguageResourceService.java