[PM-13207] Detect incompatible locale changes (#11425)

* detecting unsupported modifications in locales

* typo fix

* limit to english locales, increased verbosity

* increased verbosity

.github/workflows/locales-lint.yml

@@ -0,0 +1,34 @@
+---
+name: Locales lint for Crowdin
+
+on:
+  pull_request:
+    branches-ignore:
+      - 'l10n_master'
+      - 'cf-pages'
+    paths:
+      - '**/messages.json'
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
+      - name: Checkout base branch repo
+        uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
+        with:
+          ref: ${{ github.event.pull_request.base.sha }}
+          path: base
+      - name: Install dependencies
+        run: npm ci
+      - name: Compare
+        run: |
+          npm run test:locales
+          if [ $? -eq 0 ]; then
+            echo "Lint check successful."
+          else
+            echo "Lint check failed."
+            exit 1
+          fi