ensure gettext program is available to pre-commit

.github/workflows/pre-commit.yml

@@ -15,6 +15,8 @@ jobs:
     steps:
     - uses: actions/checkout@v1
     - uses: actions/setup-python@v1
+    - name: Install deps
+      run: sudo apt-get update && sudo apt-get install -y gettext
     - name: set PY
       run: echo >>$GITHUB_ENV PY="$(python -c 'import hashlib, sys;print(hashlib.sha256(sys.version.encode()+sys.executable.encode()).hexdigest())')"
     - uses: actions/cache@v1