added "Check localizations" action

.github/workflows/localizations.yml

@@ -0,0 +1,21 @@
+name: Localizations
+on:
+  push:
+  pull_request:
+    types: [opened, reopened]
+
+jobs:
+  check-localizations:
+    name: "Check localizations"
+    runs-on: "ubuntu-latest"
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Setup Node environment
+        uses: actions/setup-node@v3
+        with:
+          node-version: 20
+      - name: Install dependencies
+        run: npm install
+      - name: Check localizations
+        run: npm run langs:check

scripts/langs.js

@@ -361,10 +361,18 @@ let check = (logging = true) => {
 
 // run `check()` if `--check()` is set
 if (args["check"]) {
-	let problems = check();
+	let has_problems = false;
+
+	// check localizations, and set `has_problems` depending on whether
+	// any localization files have problems
+	Object.values(check()).forEach((item) => {
+		if (item.length) {
+			has_problems = true;
+		}
+	});
 
 	// exit with the correct exit code
-	if (problems.length) {
+	if (has_problems) {
 		process.exit(1);
 	} else {
 		process.exit();