feat: integrate crowdin #1402 (#1599)

.github/workflows/crowdin-schedule-download.yml

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+name: "[Crowdin] Download translations"
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * *" # every day at midnight
+
+jobs:
+  download-crowdin-translations:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Obtain token
+        id: obtainToken
+        uses: tibdex/github-app-token@v2
+        with:
+          private_key: ${{ secrets.CROWDIN_APP_PRIVATE_KEY }}
+          app_id: ${{ secrets.CROWDIN_APP_ID }}
+
+      - name: Download Crowdin translations
+        uses: crowdin/github-action@v2
+        with:
+          upload_sources: false
+          upload_translations: false
+          download_translations: true
+          localization_branch_name: crowdin
+          create_pull_request: true
+          pull_request_title: "chore(lang): updated translations from crowdin"
+          pull_request_body: "New Crowdin translations by [Crowdin GH Action](https://github.com/crowdin/github-action)"
+          pull_request_base_branch_name: "dev"
+          github_user_name: "Crowdin Homarr"
+          github_user_email: "190541745+homarr-crowdin[bot]@users.noreply.github.com"
+        env:
+          GITHUB_TOKEN: ${{ steps.obtainToken.outputs.token }}
+          CROWDIN_PROJECT_ID: ${{ secrets.CROWDIN_PROJECT_ID }}
+          CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}

.github/workflows/crowdin-upload.yml

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+name: "[Crowdin] Upload translations"
+
+on:
+  push:
+    paths:
+      - "packages/translation/src/lang/**"
+    branches: [dev]
+
+jobs:
+  upload-crowdin-translations:
+    # Don't run this action if the downloaded translations are being pushed
+    if: "!contains(github.event.head_commit.message, 'chore(lang)')"
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Upload Crowdin translations
+        uses: crowdin/github-action@v2
+        with:
+          upload_sources: true
+          upload_translations: true
+          download_translations: false
+        env:
+          CROWDIN_PROJECT_ID: ${{ secrets.CROWDIN_PROJECT_ID }}
+          CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}

crowdin.yml

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+files:
+  - source: /packages/translation/src/lang/en.json
+    translation: /packages/translation/src/lang/%two_letters_code%.json
+
+# Title of pull request and so the commit that will be used for squashed merge commit
+pull_request_title: "chore(lang): updated translations from crowdin"
+
+# Custom commit message that is not only appended
+commit_message: "chore(lang): update translations %original_file_name% from crowdin [skip ci]"
+append_commit_message: false