add workflow to comment on and close translation PRs

.github/workflows/close-translation-prs.yml

@@ -0,0 +1,62 @@
+name: Close Translation Pull Requests
+
+on:
+  pull_request:
+    branches: [ master, main, dev ]
+
+jobs:
+
+  close-translation-prs:
+    if: github.actor != 'weblate' && github.actor != 'anxdpanic' && github.repository == 'anxdpanic/script.module.python.twitch'
+
+    name: Close Translation Pull Requests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Get changed files
+        id: modified_files
+        uses: trilom/file-changes-action@v1.2.4
+        with:
+          output: ","
+
+      - name: Check the PR for translations
+        id: check
+        run: |
+          shopt -s nocasematch
+          if [[ "${{ steps.modified_files.outputs.files_modified }}" == *"en_gb/strings.po"* ]]; then
+            echo "Found modified en_gb, likely a valid PR"
+            unset CLOSE
+          elif [[ "${{ steps.modified_files.outputs.files_modified }}" == *"strings.po"* ]]; then
+            echo "Found modified strings.po, unwanted."
+            CLOSE="true"
+          elif [[ "${{ steps.modified_files.outputs.files_added }}" == *"strings.po"* ]]; then
+            echo "Found added strings.po, unwanted."
+            CLOSE="true"
+          elif [[ "${{ steps.modified_files.outputs.files_removed }}" == *"strings.po"* ]]; then
+            echo "Found removed strings.po, unwanted."
+            CLOSE="true"
+          else
+            echo "No strings.po were modified or added, not a translation."
+            unset CLOSE
+          fi
+          echo ::set-output name=close::${CLOSE}
+
+      - name: Comment on the PR
+        uses: mshick/add-pr-comment@v1
+        if: ${{ steps.check.outputs.close }}
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          repo-token-user-login: 'github-actions[bot]'
+          allow-repeats: true
+          message: |
+            A modified strings.po file was detected.
+
+            Translations are not accepted through PRs, please use Weblate if you'd like to contribute to the translations.
+            For more information see Issue #104.
+
+            If you feel this PR was closed in error, please reply below.
+            Thank you for your interest in improving this add-on.
+
+      - name: Close the PR
+        uses: peter-evans/close-pull@v1
+        if: ${{ steps.check.outputs.close }}