Dear developers please add a Textastic 866 encoding.

I really like to use your program. But not rarely need to open the code written on the PC in the program in which there is Russian text written on the PC 866 in the encoding when you open it in your program text unfortunately distorts that very uncomfortable ... Dear developers please add in 866 Russian Textastic I'm sure the encoding of the Russian users will be very grateful to you.
P.S. Sorry for my bad English.