@ambuj: No, you are right. There is the field encoding_concept_id. Unbelievable. 
It snuck in.
Ok, let’s do this: We create the UTF-8 concept so you can do your job, and in the mean time I will try to convince the community to drop that field. It should have never been there to begin with. They may push back with some good reason why it is needed for NLP.