[ci] Ensure i18n up to date

.github/workflows/i18n.yaml

@@ -0,0 +1,39 @@
+name: Check Internationalization
+# Ensure that the .po files are up to date with any changes to the guide text
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  update-i18n:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+
+      - name: Install Nox
+        run: python3 -m pip install nox
+
+      - name: Update .po files
+        run: nox -s update-release-languages
+
+      - name: Test for uncommitted changes
+        run: |
+          if [ -z "$(git status --porcelain)" ];
+          then
+            echo "No changes detected, translations are up to date!" >> $GITHUB_STEP_SUMMARY
+            exit 0
+          else
+            echo "Changes to .po files detected, please run 'nox -s update-translations' to reflect changes to source text" >> $GITHUB_STEP_SUMMARY
+            echo "$(git status)"
+            echo "$(git diff)"
+            exit 1
+          fi