I want to store each user’s location but the problem is that the location which I am getting using getUser().getLocation() returns unfiltered results. I only want the location to be in English, so is there any way to translate or set the location as null if not in English language.
This looks like it is a function for a library, not the base Twitter API.
There’s no way that I’m aware of to filter for this within the API - you’ll have to perform this step inside your code.