Add i18n fallback and outdated warning, second attempt (#531)

.github/workflows/build.yml

@@ -3,6 +3,9 @@ on:
   push:
     branches:
       - main
+  pull_request:
+    branches: [main]
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -36,6 +39,7 @@ jobs:
           pnpm install
           yarn docs:build
       - name: Deploy
+        if: github.event_name != 'pull_request'
         uses: peaceiris/actions-gh-pages@v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
@@ -47,6 +51,7 @@ jobs:
         run: |
           yarn docs:build
       - name: Deploy to main Repository
+        if: github.event_name != 'pull_request'
         uses: peaceiris/actions-gh-pages@v3
         with:
           personal_token: ${{ secrets.ACTION_PERSONAL_TOKEN }}