Just get ctrtool.exe and run>
Code:
ctrtool -p --exefs=exefs.bin --romfs=romfs.bin 00040000000a0500.cxi
Line above creates romfs.bin, then just run this line>
Code:
ctrtool -x --romfsdir=romfs_ext romfs.bin
I dont know how but it just repacks everything regarding the japanese/asian symbols. Works wonders and you dont have to use a private tool