Take a look at the [ContextFilter](https://github.com/cbmi/cilantro/blob/master/src/js/cilantro/ui/context/filters.js#L34) class used to render the invidivual filters in the context panel. You need to use the [flattenLanguage](https://github.com/cbmi/cilantro/blob/master/src/js/cilantro/ui/context/filters.js#L10-L32) function to account for nested filters.