@Override
    public TranslatableMessage getTranslatableMessage() {
        return translatableMessage;
    }
Creates a new TranslatableGuacamoleConnectionClosedException with the
given message. The message must be provided in both non-translatable
(readable as-written) and translatable forms.

@param message
    A human-readable description of the exception that occurred. This
    message should be readable on its own and as-written, without
    requiring a translation service.

@param key
    The arbitrary key which can be used to look up the message to be
    displayed in the user's native language.
guacamole-ext/src/main/java/org/apache/guacamole/language/TranslatableGuacamoleConnectionClosedException.java