Add locales required by tests

Author: amol-

.github/workflows/runtests.yml

@@ -10,6 +10,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
+      - uses: awalsh128/cache-apt-pkgs-action@latest
+        with:
+          packages: locales language-pack-it
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with: