Check for missing JSON translations (#24338)

.github/workflows/check-i18n.yml

@@ -30,13 +30,28 @@ jobs:
           ruby-version: .ruby-version
           bundler-cache: true
 
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          cache: yarn
+          node-version-file: '.nvmrc'
+
+      - name: Install all yarn packages
+        run: yarn --frozen-lockfile
+
+      - name: Check for missing strings in English JSON
+        run: |
+          yarn build:development
+          yarn manage:translations
+          git diff --exit-code
+
       - name: Check locale file normalization
         run: bundle exec i18n-tasks check-normalized
 
       - name: Check for unused strings
         run: bundle exec i18n-tasks unused
 
-      - name: Check for missing strings in English
+      - name: Check for missing strings in English YML
         run: |
           bundle exec i18n-tasks add-missing -l en
           git diff --exit-code