You would likely pyt it in the SAVEDATA folder. However that is unnecessary as all the passwords work so long as you use the English full-width font. That said it looks like they recently changed the OSK so it only shows 15 spaces at a time and it won't advance to the 16nth one until you enter the fifteenth character. I'll include screen shots to show what I mean. The first one will contain the first fifteen letters the second will be what it looks like after inputting the sixteenth and the third is the result of Isara being unlocked.
and they uploaded in the reverse order of the one I selected them in.
and they uploaded in the reverse order of the one I selected them in.