Find the difference in a keys of two different objects

object_diff.js

/**
 * This script compares two different objects
 * and finds a key value pair for keys that are missing in one object
 * and keys that are extra in another
 */

let english_dict = {
    home: {
        button: "New button",
        menu: "About"
    },
    about: "This is about page",
    contact: "This is contact page"
}

let translated_dict = {
    home: {
        button: "नयाँ बटन",
        checkbox: "चेकबक्स"
    },
    about: "यो पृष्ठ को बारे मा छ",
    blog: "यो ब्लग पृष्ठ हो"
}

function findKeys(obj) {
    var result = {};
    function recursivelyFindKeys(o, prevKey) {

        Object.keys(o).forEach(function (key) {
            let id = prevKey === '' ? key : prevKey + '.' + key
            if (typeof o[key] === 'object') {
                recursivelyFindKeys(o[key], key);
            } else {
                result[id] = o[key];
            }
        });
    }
    recursivelyFindKeys(obj, '');
    return result;
}

let english_key_values = findKeys(english_dict)
let translated_key_values = findKeys(translated_dict)

let english_keys = Object.keys(english_key_values)
let translated_keys = Object.keys(translated_key_values)

let english_keys_set = new Set(english_keys)
let translated_keys_set = new Set(translated_keys)

let missing = new Set(
    [...english_keys_set].filter(x => !translated_keys_set.has(x)));

let extra = new Set(
    [...translated_keys_set].filter(x => !english_keys_set.has(x)));

let missing_strings = [...missing].map(element => {return {[element]: english_key_values[element]}})
let unnecessary_strings = [...extra]

console.log(missing_strings)
console.log(unnecessary_strings)