feat: disable spellcheck inside code blocks

[luka-nextcloud]

📝 Summary

• Resolves: Disable browser spellcheck inside code blocks #5569

Disable spellcheck inside code blocks.

🖼️ Screenshots

🏚️ Before	🏡 After

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🚧 TODO

• ...

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits
• Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests
• Documentation (README or documentation) has been updated or is not required

[juliushaertl]

@luka-nextcloud would be nice to backport I guess?

[luka-nextcloud]

/backport to stable27

[backportbot]

The backport to stable27 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable27
git pull origin stable27

# Create the new backport branch
git checkout -b backport/5701/stable27

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 9325801e

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/5701/stable27

Error: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[luka-nextcloud]

/backport to stable28

[mejo-]

/backport to stable29