public Object getVariables() {
        return variables;
    }
Returns an arbitrary object whose properties should be substituted for
the corresponding placeholders within the string associated with the key.
If not applicable, null is returned.

@return
    An arbitrary object whose properties should be substituted for the
    corresponding placeholders within the string associated with the key,
    or null if not applicable.
guacamole-ext/src/main/java/org/apache/guacamole/language/TranslatableMessage.java