diff --git a/README.md b/README.md
index 5e6615f..708afe5 100644
--- a/README.md
+++ b/README.md
@@ -28,8 +28,9 @@ All native speakers are welcome to contribute! Please do not make pull requests
 - Fork this repo
 - Download your fork
 - In your downloaded directory, install dependencies by running `yarn`
-- If starting a new locale, create the directory named after your language tag within `locales` and copy over files from the `locales/en-US` directory
-- Make your changes/additions
+- Localize
+  - If starting a new locale, create the directory named after your language tag within `locales` and copy over files from the `locales/en-US` directory
+  - Run `yarn run --locale <locale-code>` automatically will be appended the new content in the bottom of all the files
 - Review them visually (see Verify Your Changes below)
 - Run `yarn lint:json` to validate everything is alphabetized and formatted properly
 - Commit, push, and open a pull request!
diff --git a/package.json b/package.json
index 2e08c1f..f491378 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
   },
   "scripts": {
     "compare": "node check_keys.js",
+    "update-l10n": "node update.js",
     "lint:json": "npx jsonlint -qsi locales/**/*.json"
   }
 }
diff --git a/update.js b/update.js
new file mode 100755
index 0000000..2feadd2
--- /dev/null
+++ b/update.js
@@ -0,0 +1,78 @@
+#!/usr/bin/env nodejs
+const parseArgs = require('minimist')
+const chalk = require('chalk')
+const fs = require('fs');
+
+const args = parseArgs(process.argv.slice(2))
+
+if (!args.locale) {
+    console.error(chalk.red(`Missing 'locale' argument. Exiting`))
+    process.exit(1)
+}
+
+if (!args.baseLocale) {
+    console.error(chalk.yellow(`Missing 'baseLocale' argument. Will fall back to 'en-US'`))
+}
+
+const baseLocale = args.baseLocale || 'en-US'
+const locale = args.locale
+
+function compareAndGenerate(file1, file2) {
+    const base = JSON.parse(fs.readFileSync(file1, 'utf-8'));
+    const locale_file = JSON.parse(fs.readFileSync(file2, 'utf-8'));
+
+    const missingKeys = findMissingKeys(base, locale_file);
+
+    const output = addMissingKeys(base, locale_file, missingKeys);
+
+    fs.writeFileSync(file2, JSON.stringify(output, null, 2), 'utf-8');
+}
+
+function findMissingKeys(obj1, obj2) {
+    const missingKeys = [];
+
+    for (const key in obj1) {
+        if (obj1.hasOwnProperty(key)) {
+            if (!obj2.hasOwnProperty(key)) {
+                missingKeys.push(key);
+            } else if (typeof obj1[key] === 'object' && typeof obj2[key] === 'object') {
+                const nestedMissingKeys = findMissingKeys(obj1[key], obj2[key]);
+                if (nestedMissingKeys.length > 0) {
+                    missingKeys.push(key);
+                }
+            }
+        }
+    }
+
+    return missingKeys;
+}
+
+function addMissingKeys(obj1, obj2, missingKeys) {
+    for (const key of missingKeys) {
+        if (obj1[key] !== undefined && typeof obj1[key] === 'object') {
+            obj2[key] = addMissingKeys(obj1[key], obj2[key] || {}, Object.keys(obj1[key]));
+        } else {
+            if (!obj2.hasOwnProperty(key)) {
+                obj2[key] = obj1[key];
+            }
+        }
+    }
+    return obj2;
+}
+
+const checkFile = filename => {
+    console.log(chalk.blue(`Updating ${filename}.json...`))
+
+    compareAndGenerate(`./locales/${baseLocale}/${filename}.json`, `./locales/${locale}/${filename}.json`);
+}
+
+console.log(chalk.yellow(`Updating ${locale} to ${baseLocale}...`))
+
+const filenames = [
+    'general',
+    'proton-report',
+    'protondb-content',
+    'questionnaire'
+]
+
+filenames.map(filename => checkFile(filename))