Add a job to automatically update translations

.github/list_languages

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+#!/usr/bin/env python3
+
+import argparse
+import json
+import os
+from pathlib import Path
+
+
+def parse_langs(langs, include_beta):
+    for line in langs.readlines():
+        description = line[3:-7]
+        code = line[-5:-3]
+
+        if code != 'en' and (include_beta or 'beta' not in description):
+            yield code, description
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--include-beta', help='Include beta languages', default='false',
+                        choices=('true', 'false'))
+    parser.add_argument('--langs-file', help='LANGS.md to use',
+                        type=argparse.FileType('r', encoding='UTF-8'),
+                        default=(Path(__file__).absolute().parent.parent / 'LANGS.md').as_posix())
+    args = parser.parse_args()
+
+    languages = dict(parse_langs(args.langs_file, args.include_beta == 'true'))
+
+    if 'GITHUB_ACTION' in os.environ:
+        print(f'::set-output name=languages::{json.dumps(list(languages.keys()))}')
+    for code, language in languages.items():
+        print(f'{language} ({code})')
+
+
+if __name__ == '__main__':
+    main()

.github/workflows/translations.yml

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+name: Update translations
+
+on:
+  workflow_dispatch:
+    inputs:
+      include_beta:
+        type: boolean
+        default: false
+        description: Include beta languages
+
+env:
+  GIT_AUTHOR_NAME: Django Girls Automation
+  GIT_AUTHOR_EMAIL: [email protected]
+
+jobs:
+  list_languages:
+    name: List languages
+    runs-on: ubuntu-latest
+    outputs:
+      languages: ${{ steps.set_list.outputs.languages }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set the language list
+        id: set_list
+        run: ./.github/list_languages --include-beta ${{ inputs.include_beta }}
+
+  update_language:
+    name: 'Update ${{ matrix.language }} translations from Crowdin'
+    needs: list_languages
+    if: ${{ needs.list_languages.outputs.languages != '[]' }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ${{ fromJson(needs.list_languages.outputs.languages) }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Update language
+        run: |
+          wget https://crowdin.com/backend/download/project/django-girls-tutorial/${{ matrix.language }}.zip
+          unzip ${{ matrix.language }}.zip
+          find ${{ matrix.language }} -name '*.md' -delete
+          rsync -av master/${{ matrix.language }}*/* ${{ matrix.language }}/
+          rm -rf ${{ matrix.language }}.zip master
+      - name: Open a PR
+        uses: peter-evans/create-pull-request@v3
+        with:
+          commit-message: "Update ${{ matrix.language }} translations from Crowdin"
+          branch: "update_translations/${{ matrix.language }}"
+          title: "Update ${{ matrix.language }} translations from Crowdin"
+          body: ''
+          delete-branch: true