Fix Update Translations workflow failing to create PR

The workflow checks out the newly pushed translation branch before
running peter-evans/create-pull-request, so without an explicit base
the action compared the branch against itself and errored out every
run.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: cagnulein

.github/workflows/update-translations.yml

@@ -95,6 +95,7 @@ jobs:
         uses: peter-evans/create-pull-request@v5
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          base: master
           branch: ${{ env.BRANCH_NAME }}
           title: "🌍 Update translation strings"
           body: |