Add workflows to push and pull translations from Transifex and check source file is updated when necessary

.github/workflows/check-i18n-task.yml

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+name: Check Internationalization
+
+env:
+  # See: https://github.com/actions/setup-go/tree/v2#readme
+  GO_VERSION: '1.16'
+
+# See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows
+on:
+  create:
+  push:
+    paths:
+      - '.github/workflows/check-i18n-task.ya?ml'
+      - 'package.json'
+      - '**/package.json'
+      - '**.ts'
+      - 'i18n/**'
+  pull_request:
+    paths:
+      - '.github/workflows/check-i18n-task.ya?ml'
+      - 'package.json'
+      - '**/package.json'
+      - '**.ts'
+      - 'i18n/**'
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  run-determination:
+    runs-on: ubuntu-latest
+    outputs:
+      result: ${{ steps.determination.outputs.result }}
+    steps:
+      - name: Determine if the rest of the workflow should run
+        id: determination
+        run: |
+          RELEASE_BRANCH_REGEX="refs/heads/[0-9]+.[0-9]+.x"
+          # The `create` event trigger doesn't support `branches` filters, so it's necessary to use Bash instead.
+          if [[ \
+            "${{ github.event_name }}" != "create" || \
+            "${{ github.ref }}" =~ $RELEASE_BRANCH_REGEX \
+          ]]; then
+            # Run the other jobs.
+            RESULT="true"
+          else
+            # There is no need to run the other jobs.
+            RESULT="false"
+          fi
+
+          echo "::set-output name=result::$RESULT"
+
+  check:
+    needs: run-determination
+    if: needs.run-determination.outputs.result == 'true'
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Node.js 12.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: '12.14.1'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Check for errors
+        run: yarn i18n:check

.github/workflows/i18n-nightly-push.yml

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+name: i18n-nightly-push
+
+on:
+  schedule:
+    # run every day at 1AM
+    - cron: '0 1 * * *'
+
+jobs:
+  push-to-transifex:
+    # This workflow is only of value to the arduino/arduino-ide repository and
+    # would always fail in forks
+    if: github.repository == 'arduino/arduino-ide'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install Node.js 12.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: '12.14.1'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Run i18n:push script
+        run: yarn run i18n:push
+        env:
+          TRANSIFEX_ORGANIZATION: ${{ secrets.TRANSIFEX_ORGANIZATION }}
+          TRANSIFEX_PROJECT: ${{ secrets.TRANSIFEX_PROJECT }}
+          TRANSIFEX_RESOURCE: ${{ secrets.TRANSIFEX_RESOURCE }}
+          TRANSIFEX_API_KEY: ${{ secrets.TRANSIFEX_API_KEY }}

.github/workflows/i18n-weekly-pull.yml

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+name: i18n-weekly-pull
+
+on:
+  schedule:
+    # run every monday at 2AM
+    - cron: '0 2 * * 1'
+
+jobs:
+  pull-from-transifex:
+    # This workflow is only of value to the arduino/arduino-ide repository and
+    # would always fail in forks
+    if: github.repository == 'arduino/arduino-ide'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install Node.js 12.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: '12.14.1'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Run i18n:pull script
+        run: yarn run i18n:pull
+        env:
+          TRANSIFEX_ORGANIZATION: ${{ secrets.TRANSIFEX_ORGANIZATION }}
+          TRANSIFEX_PROJECT: ${{ secrets.TRANSIFEX_PROJECT }}
+          TRANSIFEX_RESOURCE: ${{ secrets.TRANSIFEX_RESOURCE }}
+          TRANSIFEX_API_KEY: ${{ secrets.TRANSIFEX_API_KEY }}
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v3
+        with:
+          commit-message: Updated translation files
+          title: Updated translation files
+          branch: i18n/translations-update
+          author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>