It appears that some people have been working on Quintet/Shade's Brightis for the PS1 for quite a while and the translation is essentially done, but they have run into some technical issues and are presently seeking help.

https://www.romhacking.net/forum/index.php?topic=39349.20
https://github.com/Dickdebonair/Brightis-fan-translation/wiki
https://github.com/Dickdebonair/Brightis-fan-translation/discussions/24