ci: Per-file Crowdin synchronization to reduce translation PR size

.github/workflows/crowdin-opff.yml

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+name: Crowdin Sync
+
+on:
+  push:
+    branches:
+      - crowdin-trigger-opff
+
+jobs:
+  synchronize-with-crowdin-opff:
+    name: Synchronize with crowdin
+    runs-on: ubuntu-latest
+    steps:
+    - name: Crowdin action for Open Pet Food Facts only
+      uses: crowdin/[email protected]
+      with:
+        upload_translations: false # default is false
+        download_translations: true
+        skip_untranslated_files: false
+        commit_message: "New Crowdin translations - Open Pet Food Facts"
+        localization_branch_name: l10n_main_opff
+        pull_request_base_branch_name: main
+        pull_request_title: "chore: New translations - Open Pet Food Facts"
+        pull_request_labels: "translations"
+        config: ./crowdin-opff.yml
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        CROWDIN_PROJECT_ID: ${{ secrets.CROWDIN_PROJECT_ID }}
+        CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}

crowdin-opff.yml

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+project_id_env: CROWDIN_PROJECT_ID
+api_token_env: CROWDIN_PERSONAL_TOKEN
+files:
+  - source: /po/openpetfoodfacts/openpetfoodfacts.pot
+    translation: /po/openpetfoodfacts/%two_letters_code%.po
+    ignore: ["/po/openpetfoodfacts/nl.po"]
+    languages_mapping:
+      two_letters_code:
+        zh-HK: zh_HK
+        zh-CN: zh_CN
+        en-AU: en_AU
+        en-GB: en_GB
+        en-US: en_US
+        pt-BR: pt_BR
+        pt-PT: pt_PT
+        nl-BE: nl_BE
+        nl: nl_NL
+        zh-TW: zh_TW
+        sr-CS: sr_CS
+        sr: sr_RS
+        ku : kmr_TR
+        kmr: kmr