[NTG-context] space between label and number

Hi, By Hans's help, the labels of figures and of tables are appeared in Korean after setting \mainlagnuage[kr]. (\placefigure of \placetable ) Thanks! However, there is no space between label and number like "그림1" or "표3". I tried to add a space like "그림 " in the file char-def and some other files, but it won't work. When mainlanguage is english, the labels are "Figure 1" or "Table 3". There exists a space. How to add a space in this case? I have another question. Is it possible to calculate the remaining length to the bottom of the page? I'd like to add a big frame to fit the remaining space after some texts. I think that it is possible in ConTeXt. Thank you for reading. Best regards, Dalyoung