fix(babel): broken babel extract (#9790)

* fix(babel): broken babel extract

* remove unnecessary f strings

.github/workflows/superset-python.yml

@@ -50,6 +50,27 @@ jobs:
     - name: Build documentation
       run: sphinx-build -b html docs _build/html -W
 
+  babel-extract:
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        python-version: [3.6]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Setup Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        uses: apache-superset/cached-dependencies@adc6f73
+        with:
+          run: |
+            pip-install
+            pip install -r docs/requirements.txt
+      - name: Test babel extraction
+        run: flask fab babel-extract --target superset/translations --output superset/translations/messages.pot --config superset/translations/babel.cfg -k _,__,t,tn,tct
+
   test-postgres:
     runs-on: ubuntu-18.04
     strategy: