in 2018 is on vndb
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it was done by the same guys that translated BB 1 and 2. they already said they wont translate BB 3 ever. and their site is dead with no messages since 2019.
i played BB3 in 2018 with an horrible auto translator that is now abandoware, there is still several text extractors you can use to play it. my best recomendation that i use to play games today is to use an android emulator to google image translation over.
the problem with text extractors is that they take to long and you can be sitting as several extra second for eack text line witch becomes unberable over many hours in an already very long game, (3 is longer than 1 and 2).
the android emulator google translator is faster.
but in both cases you will only get the general idea since both are bad MTL translations. i did 7 years of japanese so i can mostly understand what they say so was maching the bad MTL translation to my own understanding to get the correct idea. i am also not english native so broken english doesnt botter me, but i know for natives it feels bad to read broken English.
good luck if you choose to play it with MTL is a good game and worth the play more so since you are already invested in the characters after 1 and 2.