[NTG-context] how to change 'figure 1.1' to '그림 1.1'

Hello, \placefloat will put 'figure 1.1' or 'table 1.1' below the figures(or tables). I'd like to change figure or table to my own language. I looked into the manual, but there is no option which change "figure or table". I tried "definefloat[그림][그림들]", but ConTeXt did not accept it. Is there a way to change them? Thank you. Best regards, Dalyoung