diff --git a/.github/workflows/l10n.yml b/.github/workflows/l10n.yml
new file mode 100644
index 0000000000..60f162c121
--- /dev/null
+++ b/.github/workflows/l10n.yml
@@ -0,0 +1,143 @@
+name: git-l10n
+
+on: [push, pull_request]
+
+jobs:
+  ci-config:
+    runs-on: ubuntu-latest
+    outputs:
+      enabled: ${{ steps.check-l10n.outputs.enabled }}
+    steps:
+      - name: try to clone ci-config branch
+        run: |
+          git -c protocol.version=2 clone \
+            --no-tags \
+            --single-branch \
+            -b ci-config \
+            --depth 1 \
+            --no-checkout \
+            --filter=blob:none \
+            https://github.com/${{ github.repository }} \
+            config-repo &&
+          cd config-repo &&
+          git checkout HEAD -- ci/config || : ignore
+      - id: check-l10n
+        name: check whether CI is enabled for l10n
+        run: |
+          enabled=no
+          if test -x config-repo/ci/config/allow-l10n &&
+             config-repo/ci/config/allow-l10n '${{ github.ref }}'
+          then
+            enabled=yes
+          fi
+          echo "::set-output name=enabled::$enabled"
+
+  git-po-helper:
+    needs: ci-config
+    if: needs.ci-config.outputs.enabled == 'yes'
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: '0'
+    - uses: actions/setup-go@v2
+      with:
+        go-version: ">=1.16"
+    - name: Install git-po-helper
+      run: |
+        go install github.com/git-l10n/git-po-helper@main
+    - name: Install other dependencies
+      run: |
+        sudo apt-get update -q &&
+        sudo apt-get install -q -y gettext
+    - id: check-commits
+      name: Run git-po-helper
+      run: |
+        if test "${{ github.event_name }}" = "pull_request"
+        then
+          commit_from=${{ github.event.pull_request.base.sha }}
+          commit_to=${{ github.event.pull_request.head.sha }}
+        else
+          commit_from=${{ github.event.before }}
+          commit_to=${{ github.event.after }}
+          if ! echo $commit_from | grep -q "^00*$"
+          then
+            if ! git rev-parse "$commit_from^{commit}"
+            then
+              git fetch origin $commit_from
+            fi
+          fi
+        fi
+        exit_code=0
+        git-po-helper check-commits --github-action -- \
+          $commit_from..$commit_to >git-po-helper.out 2>&1 ||
+        exit_code=$?
+        echo "::set-output name=exit_code::$exit_code"
+        has_error_msg=
+        has_warning_msg=
+        if test $exit_code -ne 0
+        then
+          has_error_msg=yes
+          if test "${{ github.event_name }}" = "pull_request"
+          then
+            echo "ERROR_MSG<<EOF" >>$GITHUB_ENV
+            grep -v -e "^level=warning" -e WARNING git-po-helper.out |
+              perl -pe 's/\e\[[0-9;]*m//g' >>$GITHUB_ENV
+            echo "EOF" >>$GITHUB_ENV
+          fi
+        fi
+        if grep -q -e "^level=warning" -e WARNING git-po-helper.out
+        then
+          has_warning_msg=yes
+          if test "${{ github.event_name }}" = "pull_request"
+          then
+            echo "WARNING_MSG<<EOF" >>$GITHUB_ENV
+            grep -v -e "^level=error" -e ERROR git-po-helper.out |
+              perl -pe 's/\e\[[0-9;]*m//g' >>$GITHUB_ENV
+            echo "EOF" >>$GITHUB_ENV
+          fi
+        fi
+        echo "::set-output name=has_error_msg::$has_error_msg"
+        echo "::set-output name=has_warning_msg::$has_warning_msg"
+    - name: Report errors in comment for pull request
+      uses: mshick/add-pr-comment@v1
+      if: steps.check-commits.outputs.has_error_msg == 'yes' && github.event_name == 'pull_request'
+      continue-on-error: true
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        repo-token-user-login: 'github-actions[bot]'
+        message: |
+          Errors found by git-po-helper in workflow ${{ github.workflow }}:
+          ```
+          ${{ env.ERROR_MSG }}
+          ```
+    - name: Report warnings in comment for pull request
+      uses: mshick/add-pr-comment@v1
+      if: steps.check-commits.outputs.has_warning_msg == 'yes' && github.event_name == 'pull_request'
+      continue-on-error: true
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        repo-token-user-login: 'github-actions[bot]'
+        message: |
+          Warnings found by git-po-helper in workflow ${{ github.workflow }}:
+          ```
+          ${{ env.WARNING_MSG }}
+          ```
+    - name: Report and quit
+      run: |
+        if test "${{ steps.check-commits.outputs.has_error_msg }}" = "yes"
+        then
+          echo "::group::Errors found by git-po-helper"
+          grep -v -e "^level=warning" -e WARNING git-po-helper.out
+          echo "::endgroup::"
+        fi
+        if test "${{ steps.check-commits.outputs.has_warning_msg }}" = "yes"
+        then
+          echo "::group::Warnings found by git-po-helper"
+          grep -v -e "^level=error" -e ERROR git-po-helper.out
+          echo "::endgroup::"
+        fi
+        if test ${{ steps.check-commits.outputs.exit_code }} -ne 0
+        then
+          exit ${{ steps.check-commits.outputs.exit_code }}
+        fi
