Ok I just tried it but it made things way worse. All the english text in the game became blank, including the main menu, button prompts, all the subtitles, literally everything. Luckily I had a backup of the file so it's normal again. I think I'll stick with the default names for now..
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Installed it in folder "Mafia II\pc\sds\text" (meaning the text_defaults.sds was added to that folder)
There was no file there originally so I just added yours.