Implement language detection in the content filter options. Use mutually exclusive allow lists and deny lists. ~~Use [franc-min](https://github.com/wooorm/franc/tree/main/packages/franc-min) for language detection.~~ I've decided to try [lande](https://github.com/fabiospampinato/lande) instead since it supports shorter inputs than franc.
