diff --git a/extra/update-language-files/index.js b/extra/update-language-files/index.js
index e449fe347..078c4e6f8 100644
--- a/extra/update-language-files/index.js
+++ b/extra/update-language-files/index.js
@@ -1,51 +1,45 @@
 // Need to use ES6 to read language files
 
 import fs from "fs";
-import path from "path";
 import util from "util";
 import rmSync from "../fs-rmSync.js";
 
-// https://stackoverflow.com/questions/13786160/copy-folder-recursively-in-node-js
 /**
- * Look ma, it's cp -R.
- * @param {string} src  The path to the thing to copy.
- * @param {string} dest The path to the new copy.
+ * Copy across the required language files
+ * Creates a local directory (./languages) and copies the required files
+ * into it.
+ * @param {string} langCode Code of language to update. A file will be
+ * created with this code if one does not already exist
+ * @param {string} baseLang The second base language file to copy. This
+ * will be ignored if set to "en" as en.js is copied by default
  */
-const copyRecursiveSync = function (src, dest) {
-    let exists = fs.existsSync(src);
-    let stats = exists && fs.statSync(src);
-    let isDirectory = exists && stats.isDirectory();
+function copyFiles(langCode, baseLang) {
+    if (fs.existsSync("./languages")) {
+        rmSync("./languages", { recursive: true });
+    }
+    fs.mkdirSync("./languages");
 
-    if (isDirectory) {
-        fs.mkdirSync(dest);
-        fs.readdirSync(src).forEach(function (childItemName) {
-            copyRecursiveSync(path.join(src, childItemName),
-                path.join(dest, childItemName));
-        });
+    if (!fs.existsSync(`../../src/languages/${langCode}.js`)) {
+        fs.closeSync(fs.openSync(`./languages/${langCode}.js`, "a"));
     } else {
-        fs.copyFileSync(src, dest);
+        fs.copyFileSync(`../../src/languages/${langCode}.js`, `./languages/${langCode}.js`);
+    }
+    fs.copyFileSync("../../src/languages/en.js", "./languages/en.js");
+    if (baseLang !== "en") {
+        fs.copyFileSync(`../../src/languages/${baseLang}.js`, `./languages/${baseLang}.js`);
     }
-};
-
-console.log("Arguments:", process.argv);
-const baseLangCode = process.argv[2] || "en";
-console.log("Base Lang: " + baseLangCode);
-if (fs.existsSync("./languages")) {
-    rmSync("./languages", { recursive: true });
 }
-copyRecursiveSync("../../src/languages", "./languages");
 
-const en = (await import("./languages/en.js")).default;
-const baseLang = (await import(`./languages/${baseLangCode}.js`)).default;
-const files = fs.readdirSync("./languages");
-console.log("Files:", files);
-
-for (const file of files) {
-    if (! file.endsWith(".js")) {
-        console.log("Skipping " + file);
-        continue;
-    }
+/**
+ * Update the specified language file
+ * @param {string} langCode Language code to update
+ * @param {string} baseLang Second language to copy keys from
+ */
+async function updateLanguage(langCode, baseLangCode) {
+    const en = (await import("./languages/en.js")).default;
+    const baseLang = (await import(`./languages/${baseLangCode}.js`)).default;
 
+    let file = langCode + ".js";
     console.log("Processing " + file);
     const lang = await import("./languages/" + file);
 
@@ -83,5 +77,20 @@ for (const file of files) {
     fs.writeFileSync(`../../src/languages/${file}`, code);
 }
 
+// Get command line arguments
+const baseLangCode = process.env.npm_config_baselang || "en";
+const langCode = process.env.npm_config_language;
+
+// We need the file to edit
+if (langCode == null) {
+    throw new Error("Argument --language=<code> must be provided");
+}
+
+console.log("Base Lang: " + baseLangCode);
+console.log("Updating: " + langCode);
+
+copyFiles(langCode, baseLangCode);
+await updateLanguage(langCode, baseLangCode);
 rmSync("./languages", { recursive: true });
+
 console.log("Done. Fixing formatting by ESLint...");
diff --git a/package.json b/package.json
index d478a1d24..f5f78f3ac 100644
--- a/package.json
+++ b/package.json
@@ -51,8 +51,7 @@
         "test-nodejs16": "docker build --progress plain -f test/ubuntu-nodejs16.dockerfile .",
         "simple-dns-server": "node extra/simple-dns-server.js",
         "simple-mqtt-server": "node extra/simple-mqtt-server.js",
-        "update-language-files-with-base-lang": "cd extra/update-language-files && node index.js %npm_config_base_lang% && eslint ../../src/languages/**.js --fix",
-        "update-language-files": "cd extra/update-language-files && node index.js && eslint ../../src/languages/**.js --fix",
+        "update-language-files": "cd extra/update-language-files && node index.js && cross-env-shell eslint ../../src/languages/$npm_config_language.js --fix",
         "ncu-patch": "npm-check-updates -u -t patch",
         "release-final": "node extra/update-version.js && npm run build-docker && node ./extra/press-any-key.js && npm run upload-artifacts && node ./extra/update-wiki-version.js",
         "release-beta": "node extra/beta/update-version.js && npm run build && node ./extra/env2arg.js docker buildx build -f docker/dockerfile --platform linux/amd64,linux/arm64,linux/arm/v7 -t louislam/uptime-kuma:$VERSION -t louislam/uptime-kuma:beta .  --target release --push && node ./extra/press-any-key.js && npm run upload-artifacts",
diff --git a/src/languages/README.md b/src/languages/README.md
index d505476a8..eddd61022 100644
--- a/src/languages/README.md
+++ b/src/languages/README.md
@@ -1,10 +1,13 @@
 # How to translate
 
 1. Fork this repo.
-2. Create a language file (e.g. `zh-TW.js`). The filename must be ISO language code: http://www.lingoes.net/en/translator/langcode.htm
-3. Run `npm run update-language-files`. You can also use this command to check if there are new strings to translate for your language.
-4. Your language file should be filled in. You can translate now.
-5. Add it into `languageList` constant.
-6. Make a [pull request](https://github.com/louislam/uptime-kuma/pulls) when you have done.
+2. Run `npm run update-language-files --language=<code>` where `<code>`
+   is a valid ISO language code:
+   http://www.lingoes.net/en/translator/langcode.htm. You can also use
+   this command to check if there are new strings to
+   translate for your language.
+3. Your language file should be filled in. You can translate now.
+4. Add it into `languageList` constant.
+5. Make a [pull request](https://github.com/louislam/uptime-kuma/pulls) when you have done.
 
 If you do not have programming skills, let me know in [the issues section](https://github.com/louislam/uptime-kuma/issues). I will assist you. 😏