Add Crowdin localization workflow and configuration

This commit introduces a new GitHub workflow for synchronizing with Crowdin, including configuration files for uploading sources and managing translations.

.github/workflows/crowdin.yml

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+name: Crowdin Action
+
+on:
+  push:
+    branches: [ master ]
+
+jobs:
+  synchronize-with-crowdin:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Synchronize with Crowdin
+        uses: crowdin/github-action@v2
+        with:
+          config: 'config/crowdin/crowdin.yml'
+          upload_sources: true
+          upload_translations: false
+          download_translations: true
+          localization_branch_name: l10n_crowdin_translations
+          create_pull_request: true
+          pull_request_title: 'chore(l10n): New Crowdin Translations'
+          pull_request_body: 'New Crowdin translations by [Crowdin GH Action](https://github.com/crowdin/github-action)'
+          pull_request_base_branch_name: 'master'
+          crowdin_branch_name: 'master'
+        env:
+          # A classic GitHub Personal Access Token with the 'repo' scope selected (the user should have write access to the repository).
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+
+          # A numeric ID, found at https://crowdin.com/project/<projectName>/tools/api
+          CROWDIN_PROJECT_ID: ${{ secrets.CROWDIN_PROJECT_ID }}
+
+          # Visit https://crowdin.com/settings#api-key to create this token
+          CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}

config/crowdin/crowdin.yml

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+#
+# Basic Crowdin CLI configuration
+# See https://crowdin.github.io/crowdin-cli/configuration for more information
+# See https://support.crowdin.com/developer/configuration-file/ for all available options
+#
+
+#
+# Crowdin credentials
+#
+"project_id_env": "CROWDIN_PROJECT_ID"
+"api_token_env": "CROWDIN_PERSONAL_TOKEN"
+"base_path": "."
+"base_url": "https://meshtastic.api.crowdin.com"
+
+#
+# Defines whether to preserve the original directory structure in the Crowdin project
+# Recommended to set to true
+#
+"preserve_hierarchy": false
+
+#
+# Files configuration.
+# See https://support.crowdin.com/developer/configuration-file/ for all available options
+#
+"files": [
+  {
+    "source": "/**/values/strings.xml",
+    "translation": "/**/values-%two_letters_code%/%original_file_name%",
+    "translation_replace": {
+      "sr-Latn": "b+sr+Latn",
+    },
+    "update_strings": true,
+    "cleanup_mode": true,
+    "escape_special_characters": 1
+  }
+]