Add English localization and MIT-licensed public release documentation

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug or compatibility report
+about: Report a reproducible problem or a tested hardware combination
+---
+
+**System**
+- Distribution and version:
+- Desktop environment:
+- App version or commit:
+- BTD 700 firmware:
+- Headphones and firmware:
+
+**What happened?**
+Describe your steps, expected result and actual result.
+
+**Demo mode**
+Does the issue also occur with `./run.sh --demo`?
+
+**Checks performed**
+List which controls you tested and whether this was a real dongle or a simulation.
+
+**Logs or screenshots**
+Remove passwords, serial numbers and personal broadcast names. Do not upload
+vendor executables or firmware images.

.github/workflows/tests.yml

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+name: Tests
+
+on:
+  push:
+    branches: [main]
+    tags: ['v*']
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  unit:
+    runs-on: ubuntu-24.04
+    strategy:
+      matrix:
+        python-version: ['3.10', '3.14']
+        language: [en, de]
+    env:
+      BTD700_LANGUAGE: ${{ matrix.language }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Run tests without USB access
+        run: python -m unittest discover -s tests -v
+      - name: Check CLI startup
+        run: python -m btd700 --language en --demo status