You need the BepInEx translator tool for it and it use google translate which is usually bad. Open the translator config with a textedior of your choice:
Code:
<your game path>ai-girl\BepInEx\config\AutoTranslatorConfig.ini
Then change the translation like:
Code:
[Service]
Endpoint=GoogleTranslate
[General]
Language=en # <--- you need to change this to your region. en is for english
FromLanguage=ja
