What is the path and file displaying language choices in settings section?

Hello commuity!
About a month ago I changed a file in the web container to show just specific languages. I need to revert this change but can’t seem to find the file… I can remember that it was a file, which was written in one long line and I deleted the languages I didn’t want to be shown. If anybody knows about which file im talking about, would greatly appreciate an answer.
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