🔧(ci) use uv in crowding jobs

We miss to migrate to uv in crowding jobs

.github/workflows/crowdin_upload.yml

@@ -3,7 +3,7 @@ name: Update crowdin sources
 on:
   workflow_dispatch:
   push:
-    branches: 
+    branches:
       - main
 
 permissions:
@@ -13,7 +13,7 @@ jobs:
   install-dependencies:
     uses: ./.github/workflows/dependencies.yml
     with:
-      node_version: '22.x'
+      node_version: "22.x"
       with-front-dependencies-installation: true
       with-build_mails: true
 
@@ -25,16 +25,15 @@ jobs:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       # Backend i18n
-      - name: Install Python
+      - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
-          python-version: "3.14.4"
-          cache: "pip"
-      - name: Upgrade pip and setuptools
-        run: pip install --upgrade pip setuptools
-      - name: Install development dependencies
-        run: pip install --user .
+          python-version-file: "src/backend/pyproject.toml"
+      - name: Install uv
+        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
+      - name: Install the project
         working-directory: src/backend
+        run: uv sync --locked --all-extras
       - name: Restore the mail templates
         uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         id: mail-templates
@@ -49,7 +48,7 @@ jobs:
       - name: generate pot files
         working-directory: src/backend
         run: |
-          DJANGO_CONFIGURATION=Build python manage.py makemessages -a --keep-pot
+          DJANGO_CONFIGURATION=Build uv run python manage.py makemessages -a --keep-pot
       # frontend i18n
       - name: Restore the frontend cache
         uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5