Switch messages.po check to drone

.github/workflows/transifex.yml

@@ -1,31 +0,0 @@
-name: Transifex
-on: [push, pull_request]
-
-jobs:
-  messages:
-    name: Check messages.po changes
-    runs-on: ubuntu-latest
-    steps:
-      - name: Install gettext
-        run: sudo apt-get install gettext
-
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Run Xgettext
-        run: ./bin/run_xgettext.sh
-
-      - name: Check if messages.po needs an update
-        run: |
-          echo "::group::Check messages.po"
-          # Skip first 4 lines in possible diff, because they're header
-          # Skip all lines of the git diff starting with "@@" or comments or starting "POT-Creation-Date"
-          if [[ $(git diff -U0 ./view/lang/C/messages.po | awk '!/@@|-"POT-Creation-Date|+"POT-Creation-Date|-#|+#/{print }' | wc -l) -gt 4 ]]; then
-            echo "::error file=messages.po::messages.po is out of date"
-            echo "$(git diff ./view/lang/C/messages.po)"
-            exit 1
-          else
-            echo "Nothing to update"
-          fi
-          echo "::endgroup::"
-        shell: bash