Thnak you for your reply. I understand what you mean about the sizes, and the way files are handled, and indeed that might prove to be a pain without a tool. I will try romhacking to see what is available there.
I will be using the PAL version of the game to do so, since my "quest" is to have a localised PAL version as Final Fantasy IX is (Fina Fantasy VIII is half way localised, since half words are american englesh and half were done in UK english...).
I imagined the .dat files were where the dialog is stored, but this includes only the field dialog. I need to find the equivalent of kerenl2.bin file of the PC version, since I need to edit spell names as well. I can't find thaty for the life of me, as there is no "kernel" folder in the PSX version. But, I shall try asking at romhacking.net as well.
Thanks again.
PS: The reason I tried to avoid the "low-level" technical details, is because it is a matter of approach as to home much time is needed to spend on it, comparing to the time needed to actually translate. I have a very bad experience from many linux users, who forget the simple word "efficiency" when distributing packages, and one has to spend half of his life looking for dependancies, because they, for some reason, suppose they are easy to be found, or simply forget who they are aiming at which is a user not a programmer. I apologise for my tone, but we technicians (me on a hardware level) tend to forget sometimes that the average joe simply may not want to dwell in the information we as technicians like to dwell into

. I just wanted to be straight from the beginning. Thanks again.