Hi, there are also two areas in the eboot.bin where plain text exists in JP, EN, FR (but only the JP is shown in game)
Eboot is not compressed so if someone wants to try and insert the EN texts, I just made some UTF-8 extraction in attached files.
Or - at least for the help menu - the translation could be directly written in the pictures with any PNG editor, and the JP text nullified.
There must be a trigger somewhere to change the code language form JP to EN but I am not capable to find it.