Setup spell checker for localizable file

Signed-off-by: Marcel Müller <[email protected]>

.github/workflows/spelling.yml

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+name: Spellcheck
+
+on:
+  push:
+    branches:
+      - master
+
+  pull_request:
+    paths:
+      - '.github/workflows/**'
+      - NextcloudTalk/en.lproj/Localizable.strings
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  spelling:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Set up Python 3.11
+      uses: actions/setup-python@v4
+      with:
+        python-version: 3.11
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip setuptools
+        python -m pip install pyspelling
+        # Install any additional libraries required: additional plugins, documentation building libraries, etc.
+
+    - name: Install Aspell
+      run: |
+        sudo apt-get install aspell aspell-en
+
+    - name: Spell check
+      run: |
+        python -m pyspelling

.pyspelling.wordlist.txt

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+AirPlay
+Cancelled
+HPB
+Matterbridge
+Nextcloud
+Repo
+backend
+formattedPhoneNumber
+https
+ld
+listable
+lu

.pyspelling.yml

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+matrix:
+- name: English localizable file
+  aspell:
+    lang: en
+    d: en_US
+  dictionary:
+    wordlists:
+      - .pyspelling.wordlist.txt
+  pipeline:
+  - pyspelling.filters.cpp:
+      line_comments: false
+      block_comments: false
+  sources:
+  - NextcloudTalk/en.lproj/Localizable.strings