Use git cli to get branch name instead of script output

Author: steppi

.github/workflows/auto-translations-pr.yml

@@ -34,7 +34,8 @@ jobs:
         run: |
           git config --global user.email "[email protected]"
           git config --global user.name "GitHub Actions"
-          branch_name=$(../automations/scripts/create_branch_for_language.sh origin main l10n_main ${{ github.event.inputs.language_code }})
+          ../automations/scripts/create_branch_for_language.sh origin main l10n_main ${{ github.event.inputs.language_code }}
+          branch_name=$(git rev-parse --abbrev-ref HEAD)
           echo "BRANCH_NAME=$branch_name" >> $GITHUB_ENV
         working-directory: ./numpy.org