This mod doesn't work correctly for me, in the way many button icons are mixed up. Judging by both Duel and button config, it seems L1 and R1 are correct. but....
circle is a triangle
triangle is a square
square is a cross
cross is a circle
start is a R stick
select is a L stick
L2 is a select
R2 is a start
i'm currently playing italian and i'm currently using the txt files for buttons_it and buttons_config
P.S.: i'll leave this comment with this final note, thank you for the easy file to manage and edit, i feared it was more complex than this so i didn't try, but in the end i saw it has basic configuration so all i needed was to change the assigned value for each button and it's all good now!