think of translation like a patch, apply it to main game by overwriting it, then try run the game like normal
if you have the translations as whole project, that's probably mean you have the post-patched game file, no need for workaround, just run the game as is
abandon all hope for official translation, the game is way too old for that, there's translation for the next game after this one (Chevalier Histoire) and dev already finish making another game after that one (Living Together) which have higher chance to get official translation than this.