Hey there. In theory this can be done by creating a mod package that would install through the Anniversary Edition Installer. The mod would replace the SUBTsubtitles and SUBTmessages files in Oni. I'm not totally sure that the game supports Turkish characters, and it's a lot of text to translate, so you would probably want to create a test package that only replaced one subtitle, write something that uses the full Turkish alphabet, and see if it worked, before doing more translation work.To learn how to make a mod package, see here: https://wiki.oni2.net/Making_a_mod_package. To learn from example, you can also download a mod package from the Mod Depot or look at one that downloaded after you install the AE. You'll then have to extract the existing SUBT files from the game with OniSplit, modify them and put them in your new package, then try installing it.
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